6a76da08a3
* java/lang/String.java (data, boffset, count): Documented. (String(byte[],String)): Reformatted. (String(byte[])): Likewise. (lastIndexOf(int)): Likewise. (lastIndexOf(String)): Likewise. (substring(int)): Renamed argument to match Classpath. (String(StringBuffer)): Don't share buffer if it is nearly empty. From-SVN: r65070
1258 lines
44 KiB
Java
1258 lines
44 KiB
Java
/* String.java -- immutable character sequences; the object of string literals
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Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003
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Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.lang;
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import java.io.UnsupportedEncodingException;
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import java.io.Serializable;
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import java.lang.Comparable;
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import java.util.Comparator;
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import java.util.Locale;
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import java.util.regex.Pattern;
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import java.util.regex.PatternSyntaxException;
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/**
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* Strings represent an immutable set of characters. All String literals
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* are instances of this class, and two string literals with the same contents
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* refer to the same String object.
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*
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* <p>This class also includes a number of methods for manipulating the
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* contents of strings (of course, creating a new object if there are any
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* changes, as String is immutable). Case mapping relies on Unicode 3.0.0
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* standards, where some character sequences have a different number of
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* characters in the uppercase version than the lower case.
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*
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* <p>Strings are special, in that they are the only object with an overloaded
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* operator. When you use '+' with at least one String argument, both
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* arguments have String conversion performed on them, and another String (not
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* guaranteed to be unique) results.
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*
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* <p>String is special-cased when doing data serialization - rather than
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* listing the fields of this class, a String object is converted to a string
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* literal in the object stream.
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*
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* @author Paul N. Fisher
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* @author Eric Blake <ebb9@email.byu.edu>
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* @author Per Bothner <bothner@cygnus.com>
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* @since 1.0
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* @status updated to 1.4
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*/
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public final class String implements Serializable, Comparable, CharSequence
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{
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// WARNING: String is a CORE class in the bootstrap cycle. See the comments
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// in vm/reference/java/lang/Runtime for implications of this fact.
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/**
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* This is probably not necessary because this class is special cased already
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* but it will avoid showing up as a discrepancy when comparing SUIDs.
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*/
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private static final long serialVersionUID = -6849794470754667710L;
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/**
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* This is the object that holds the characters that make up the
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* String. It might be a char[], or it could be String. It could
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* even be `this'. The actual characters can't be located using
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* pure Java code.
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* @see #boffset
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*/
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private Object data;
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/**
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* This is a <emph>byte</emph> offset of the actual characters from
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* the start of the character-holding object. Don't use this field
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* in Java code.
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*/
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private int boffset;
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/**
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* Holds the number of characters in value. Package visible for use
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* by trusted code.
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*/
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int count;
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/**
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* Caches the result of hashCode(). If this value is zero, the hashcode
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* is considered uncached (even if 0 is the correct hash value).
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*/
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private int cachedHashCode;
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/**
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* An implementation for {@link CASE_INSENSITIVE_ORDER}.
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* This must be {@link Serializable}. The class name is dictated by
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* compatibility with Sun's JDK.
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*/
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private static final class CaseInsensitiveComparator
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implements Comparator, Serializable
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{
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/**
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* Compatible with JDK 1.2.
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*/
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private static final long serialVersionUID = 8575799808933029326L;
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/**
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* The default private constructor generates unnecessary overhead.
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*/
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CaseInsensitiveComparator() {}
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/**
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* Compares to Strings, using
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* <code>String.compareToIgnoreCase(String)</code>.
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*
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* @param o1 the first string
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* @param o2 the second string
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* @return < 0, 0, or > 0 depending on the case-insensitive
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* comparison of the two strings.
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* @throws NullPointerException if either argument is null
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* @throws ClassCastException if either argument is not a String
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* @see #compareToIgnoreCase(String)
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*/
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public int compare(Object o1, Object o2)
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{
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return ((String) o1).compareToIgnoreCase((String) o2);
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}
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} // class CaseInsensitiveComparator
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/**
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* A Comparator that uses <code>String.compareToIgnoreCase(String)</code>.
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* This comparator is {@link Serializable}. Note that it ignores Locale,
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* for that, you want a Collator.
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*
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* @see Collator#compare(String, String)
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* @since 1.2
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*/
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public static final Comparator CASE_INSENSITIVE_ORDER
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= new CaseInsensitiveComparator();
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/**
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* Creates an empty String (length 0). Unless you really need a new object,
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* consider using <code>""</code> instead.
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*/
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public String()
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{
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data = "".data;
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boffset = 0;
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count = 0;
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}
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/**
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* Copies the contents of a String to a new String. Since Strings are
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* immutable, only a shallow copy is performed.
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*
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* @param str String to copy
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* @throws NullPointerException if value is null
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*/
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public String(String str)
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{
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data = str.data;
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boffset = str.boffset;
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count = str.count;
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cachedHashCode = str.cachedHashCode;
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}
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/**
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* Creates a new String using the character sequence of the char array.
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* Subsequent changes to data do not affect the String.
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*
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* @param data char array to copy
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* @throws NullPointerException if data is null
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*/
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public String(char[] data)
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{
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init(data, 0, data.length, false);
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}
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/**
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* Creates a new String using the character sequence of a subarray of
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* characters. The string starts at offset, and copies count chars.
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* Subsequent changes to data do not affect the String.
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*
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* @param data char array to copy
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* @param offset position (base 0) to start copying out of data
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* @param count the number of characters from data to copy
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* @throws NullPointerException if data is null
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* @throws IndexOutOfBoundsException if (offset < 0 || count < 0
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* || offset + count > data.length)
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* (while unspecified, this is a StringIndexOutOfBoundsException)
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*/
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public String(char[] data, int offset, int count)
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{
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init(data, offset, count, false);
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}
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/**
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* Creates a new String using an 8-bit array of integer values, starting at
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* an offset, and copying up to the count. Each character c, using
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* corresponding byte b, is created in the new String as if by performing:
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*
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* <pre>
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* c = (char) (((hibyte & 0xff) << 8) | (b & 0xff))
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* </pre>
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*
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* @param ascii array of integer values
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* @param hibyte top byte of each Unicode character
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* @param offset position (base 0) to start copying out of ascii
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* @param count the number of characters from ascii to copy
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* @throws NullPointerException if ascii is null
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* @throws IndexOutOfBoundsException if (offset < 0 || count < 0
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* || offset + count > ascii.length)
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* (while unspecified, this is a StringIndexOutOfBoundsException)
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* @see #String(byte[])
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* @see #String(byte[], String)
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* @see #String(byte[], int, int)
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* @see #String(byte[], int, int, String)
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* @deprecated use {@link #String(byte[], int, int, String)} to perform
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* correct encoding
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*/
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public String(byte[] ascii, int hibyte, int offset, int count)
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{
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init(ascii, hibyte, offset, count);
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}
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/**
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* Creates a new String using an 8-bit array of integer values. Each
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* character c, using corresponding byte b, is created in the new String
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* as if by performing:
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*
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* <pre>
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* c = (char) (((hibyte & 0xff) << 8) | (b & 0xff))
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* </pre>
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*
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* @param ascii array of integer values
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* @param hibyte top byte of each Unicode character
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* @throws NullPointerException if ascii is null
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* @see #String(byte[])
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* @see #String(byte[], String)
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* @see #String(byte[], int, int)
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* @see #String(byte[], int, int, String)
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* @see #String(byte[], int, int, int)
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* @deprecated use {@link #String(byte[], String)} to perform
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* correct encoding
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*/
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public String(byte[] ascii, int hibyte)
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{
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init(ascii, hibyte, 0, ascii.length);
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}
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/**
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* Creates a new String using the portion of the byte array starting at the
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* offset and ending at offset + count. Uses the specified encoding type
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* to decode the byte array, so the resulting string may be longer or
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* shorter than the byte array. For more decoding control, use
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* {@link java.nio.charset.CharsetDecoder}, and for valid character sets,
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* see {@link java.nio.charset.Charset}. The behavior is not specified if
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* the decoder encounters invalid characters; this implementation throws
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* an Error.
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*
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* @param data byte array to copy
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* @param offset the offset to start at
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* @param count the number of characters in the array to use
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* @param encoding the name of the encoding to use
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* @throws NullPointerException if data or encoding is null
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* @throws IndexOutOfBoundsException if offset or count is incorrect
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* (while unspecified, this is a StringIndexOutOfBoundsException)
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* @throws UnsupportedEncodingException if encoding is not found
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* @throws Error if the decoding fails
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* @since 1.1
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*/
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public String(byte[] data, int offset, int count, String encoding)
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throws UnsupportedEncodingException
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{
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init (data, offset, count, encoding);
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}
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/**
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* Creates a new String using the byte array. Uses the specified encoding
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* type to decode the byte array, so the resulting string may be longer or
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* shorter than the byte array. For more decoding control, use
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* {@link java.nio.charset.CharsetDecoder}, and for valid character sets,
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* see {@link java.nio.charset.Charset}. The behavior is not specified if
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* the decoder encounters invalid characters; this implementation throws
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* an Error.
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*
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* @param data byte array to copy
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* @param encoding the name of the encoding to use
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* @throws NullPointerException if data or encoding is null
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* @throws UnsupportedEncodingException if encoding is not found
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* @throws Error if the decoding fails
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* @see #String(byte[], int, int, String)
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* @since 1.1
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*/
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public String(byte[] data, String encoding)
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throws UnsupportedEncodingException
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{
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this(data, 0, data.length, encoding);
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}
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/**
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* Creates a new String using the portion of the byte array starting at the
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* offset and ending at offset + count. Uses the encoding of the platform's
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* default charset, so the resulting string may be longer or shorter than
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* the byte array. For more decoding control, use
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* {@link java.nio.charset.CharsetDecoder}. The behavior is not specified
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* if the decoder encounters invalid characters; this implementation throws
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* an Error.
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*
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* @param data byte array to copy
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* @param offset the offset to start at
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* @param count the number of characters in the array to use
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* @throws NullPointerException if data is null
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* @throws IndexOutOfBoundsException if offset or count is incorrect
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* @throws Error if the decoding fails
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* @see #String(byte[], int, int, String)
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* @since 1.1
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*/
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public String(byte[] data, int offset, int count)
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{
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try
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{
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init (data, offset, count,
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System.getProperty("file.encoding", "8859_1"));
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}
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catch (UnsupportedEncodingException x1)
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{
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// Maybe the default encoding is bad.
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try
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{
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init (data, offset, count, "8859_1");
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}
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catch (UnsupportedEncodingException x2)
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{
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// We know this can't happen.
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}
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}
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}
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/**
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* Creates a new String using the byte array. Uses the encoding of the
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* platform's default charset, so the resulting string may be longer or
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* shorter than the byte array. For more decoding control, use
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* {@link java.nio.charset.CharsetDecoder}. The behavior is not specified
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* if the decoder encounters invalid characters; this implementation throws
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* an Error.
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*
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* @param data byte array to copy
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* @throws NullPointerException if data is null
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* @throws Error if the decoding fails
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* @see #String(byte[], int, int)
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* @see #String(byte[], int, int, String)
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* @since 1.1
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*/
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public String(byte[] data)
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{
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this(data, 0, data.length);
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}
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/**
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* Creates a new String using the character sequence represented by
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* the StringBuffer. Subsequent changes to buf do not affect the String.
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*
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* @param buffer StringBuffer to copy
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* @throws NullPointerException if buffer is null
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*/
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public String(StringBuffer buffer)
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{
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synchronized (buffer)
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{
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// Share unless buffer is 3/4 empty.
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boolean should_copy = ((buffer.count << 2) < buffer.value.length);
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if (! should_copy)
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buffer.shared = true;
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init (buffer.value, 0, buffer.count, ! should_copy);
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}
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}
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/**
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* Special constructor which can share an array when safe to do so.
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*
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* @param data the characters to copy
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* @param offset the location to start from
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* @param count the number of characters to use
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* @param dont_copy true if the array is trusted, and need not be copied
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* @throws NullPointerException if chars is null
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* @throws StringIndexOutOfBoundsException if bounds check fails
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*/
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String(char[] data, int offset, int count, boolean dont_copy)
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{
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init(data, offset, count, dont_copy);
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}
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// This is used by gnu.gcj.runtime.StringBuffer, so it must have
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// package-private protection. It is accessed via CNI and so avoids
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// ordinary protection mechanisms.
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String(gnu.gcj.runtime.StringBuffer buffer)
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{
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// No need to synchronize or mark the buffer, since we know it is
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// only used once.
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init (buffer.value, 0, buffer.count, true);
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}
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/**
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* Returns the number of characters contained in this String.
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*
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* @return the length of this String
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*/
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public int length()
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{
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return count;
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}
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/**
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* Returns the character located at the specified index within this String.
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*
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* @param index position of character to return (base 0)
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* @return character located at position index
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* @throws IndexOutOfBoundsException if index < 0 || index >= length()
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* (while unspecified, this is a StringIndexOutOfBoundsException)
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*/
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public native char charAt(int index);
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/**
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* Copies characters from this String starting at a specified start index,
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* ending at a specified stop index, to a character array starting at
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* a specified destination begin index.
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*
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* @param srcBegin index to begin copying characters from this String
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* @param srcEnd index after the last character to be copied from this String
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* @param dst character array which this String is copied into
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* @param dstBegin index to start writing characters into dst
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* @throws NullPointerException if dst is null
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* @throws IndexOutOfBoundsException if any indices are out of bounds
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* (while unspecified, source problems cause a
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* StringIndexOutOfBoundsException, and dst problems cause an
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* ArrayIndexOutOfBoundsException)
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*/
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public native void getChars(int srcBegin, int srcEnd,
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char[] dst, int dstBegin);
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|
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/**
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* Copies the low byte of each character from this String starting at a
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* specified start index, ending at a specified stop index, to a byte array
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* starting at a specified destination begin index.
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*
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* @param srcBegin index to being copying characters from this String
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* @param srcEnd index after the last character to be copied from this String
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* @param dst byte array which each low byte of this String is copied into
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* @param dstBegin index to start writing characters into dst
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* @throws NullPointerException if dst is null and copy length is non-zero
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* @throws IndexOutOfBoundsException if any indices are out of bounds
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* (while unspecified, source problems cause a
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* StringIndexOutOfBoundsException, and dst problems cause an
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* ArrayIndexOutOfBoundsException)
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* @see #getBytes()
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|
* @see #getBytes(String)
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* @deprecated use {@link #getBytes()}, which uses a char to byte encoder
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*/
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public native void getBytes(int srcBegin, int srcEnd,
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byte[] dst, int dstBegin);
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|
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/**
|
|
* Converts the Unicode characters in this String to a byte array. Uses the
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* specified encoding method, so the result may be longer or shorter than
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* the String. For more encoding control, use
|
|
* {@link java.nio.charset.CharsetEncoder}, and for valid character sets,
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|
* see {@link java.nio.charset.Charset}. The behavior is not specified if
|
|
* the encoder encounters a problem; this implementation returns null.
|
|
*
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* @param enc encoding name
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* @return the resulting byte array, or null on a problem
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|
* @throws NullPointerException if enc is null
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|
* @throws UnsupportedEncodingException if encoding is not supported
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* @since 1.1
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*/
|
|
public native byte[] getBytes(String enc)
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throws UnsupportedEncodingException;
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|
|
/**
|
|
* Converts the Unicode characters in this String to a byte array. Uses the
|
|
* encoding of the platform's default charset, so the result may be longer
|
|
* or shorter than the String. For more encoding control, use
|
|
* {@link java.nio.charset.CharsetEncoder}. The behavior is not specified if
|
|
* the encoder encounters a problem; this implementation returns null.
|
|
*
|
|
* @return the resulting byte array, or null on a problem
|
|
* @since 1.1
|
|
*/
|
|
public byte[] getBytes()
|
|
{
|
|
try
|
|
{
|
|
return getBytes (System.getProperty("file.encoding", "8859_1"));
|
|
}
|
|
catch (UnsupportedEncodingException x)
|
|
{
|
|
// This probably shouldn't happen, but could if file.encoding
|
|
// is somehow changed to a value we don't understand.
|
|
try
|
|
{
|
|
return getBytes ("8859_1");
|
|
}
|
|
catch (UnsupportedEncodingException x2)
|
|
{
|
|
// This really shouldn't happen, because the 8859_1
|
|
// encoding should always be available.
|
|
throw new InternalError ("couldn't find 8859_1 encoder");
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Predicate which compares anObject to this. This is true only for Strings
|
|
* with the same character sequence.
|
|
*
|
|
* @param anObject the object to compare
|
|
* @return true if anObject is semantically equal to this
|
|
* @see #compareTo(String)
|
|
* @see #equalsIgnoreCase(String)
|
|
*/
|
|
public native boolean equals(Object anObject);
|
|
|
|
/**
|
|
* Compares the given StringBuffer to this String. This is true if the
|
|
* StringBuffer has the same content as this String at this moment.
|
|
*
|
|
* @param buffer the StringBuffer to compare to
|
|
* @return true if StringBuffer has the same character sequence
|
|
* @throws NullPointerException if the given StringBuffer is null
|
|
* @since 1.4
|
|
*/
|
|
public native boolean contentEquals(StringBuffer buffer);
|
|
|
|
/**
|
|
* Compares a String to this String, ignoring case. This does not handle
|
|
* multi-character capitalization exceptions; instead the comparison is
|
|
* made on a character-by-character basis, and is true if:<br><ul>
|
|
* <li><code>c1 == c2</code></li>
|
|
* <li><code>Character.toUpperCase(c1)
|
|
* == Character.toUpperCase(c2)</code></li>
|
|
* <li><code>Character.toLowerCase(c1)
|
|
* == Character.toLowerCase(c2)</code></li>
|
|
* </ul>
|
|
*
|
|
* @param anotherString String to compare to this String
|
|
* @return true if anotherString is equal, ignoring case
|
|
* @see #equals(Object)
|
|
* @see Character#toUpperCase(char)
|
|
* @see Character#toLowerCase(char)
|
|
*/
|
|
public native boolean equalsIgnoreCase(String anotherString);
|
|
|
|
/**
|
|
* Compares this String and another String (case sensitive,
|
|
* lexicographically). The result is less than 0 if this string sorts
|
|
* before the other, 0 if they are equal, and greater than 0 otherwise.
|
|
* After any common starting sequence is skipped, the result is
|
|
* <code>this.charAt(k) - anotherString.charAt(k)</code> if both strings
|
|
* have characters remaining, or
|
|
* <code>this.length() - anotherString.length()</code> if one string is
|
|
* a subsequence of the other.
|
|
*
|
|
* @param anotherString the String to compare against
|
|
* @return the comparison
|
|
* @throws NullPointerException if anotherString is null
|
|
*/
|
|
public native int compareTo(String anotherString);
|
|
|
|
/**
|
|
* Behaves like <code>compareTo(java.lang.String)</code> unless the Object
|
|
* is not a <code>String</code>. Then it throws a
|
|
* <code>ClassCastException</code>.
|
|
*
|
|
* @param o the object to compare against
|
|
* @return the comparison
|
|
* @throws NullPointerException if o is null
|
|
* @throws ClassCastException if o is not a <code>String</code>
|
|
* @since 1.2
|
|
*/
|
|
public int compareTo(Object o)
|
|
{
|
|
return compareTo((String) o);
|
|
}
|
|
|
|
/**
|
|
* Compares this String and another String (case insensitive). This
|
|
* comparison is <em>similar</em> to equalsIgnoreCase, in that it ignores
|
|
* locale and multi-characater capitalization, and compares characters
|
|
* after performing
|
|
* <code>Character.toLowerCase(Character.toUpperCase(c))</code> on each
|
|
* character of the string. This is unsatisfactory for locale-based
|
|
* comparison, in which case you should use {@link java.text.Collator}.
|
|
*
|
|
* @param s the string to compare against
|
|
* @return the comparison
|
|
* @see Collator#compare(String, String)
|
|
* @since 1.2
|
|
*/
|
|
public int compareToIgnoreCase(String str)
|
|
{
|
|
return this.toUpperCase().toLowerCase().compareTo(
|
|
str.toUpperCase().toLowerCase());
|
|
}
|
|
|
|
/**
|
|
* Predicate which determines if this String matches another String
|
|
* starting at a specified offset for each String and continuing
|
|
* for a specified length. Indices out of bounds are harmless, and give
|
|
* a false result.
|
|
*
|
|
* @param toffset index to start comparison at for this String
|
|
* @param other String to compare region to this String
|
|
* @param oofset index to start comparison at for other
|
|
* @param len number of characters to compare
|
|
* @return true if regions match (case sensitive)
|
|
* @throws NullPointerException if other is null
|
|
*/
|
|
public native boolean regionMatches(int toffset,
|
|
String other, int ooffset, int len);
|
|
|
|
/**
|
|
* Predicate which determines if this String matches another String
|
|
* starting at a specified offset for each String and continuing
|
|
* for a specified length, optionally ignoring case. Indices out of bounds
|
|
* are harmless, and give a false result. Case comparisons are based on
|
|
* <code>Character.toLowerCase()</code> and
|
|
* <code>Character.toUpperCase()</code>, not on multi-character
|
|
* capitalization expansions.
|
|
*
|
|
* @param ignoreCase true if case should be ignored in comparision
|
|
* @param toffset index to start comparison at for this String
|
|
* @param other String to compare region to this String
|
|
* @param oofset index to start comparison at for other
|
|
* @param len number of characters to compare
|
|
* @return true if regions match, false otherwise
|
|
* @throws NullPointerException if other is null
|
|
*/
|
|
public native boolean regionMatches(boolean ignoreCase, int toffset,
|
|
String other, int ooffset, int len);
|
|
|
|
/**
|
|
* Predicate which determines if this String contains the given prefix,
|
|
* beginning comparison at toffset. The result is false if toffset is
|
|
* negative or greater than this.length(), otherwise it is the same as
|
|
* <code>this.subString(toffset).startsWith(prefix)</code>.
|
|
*
|
|
* @param prefix String to compare
|
|
* @param toffset offset for this String where comparison starts
|
|
* @return true if this String starts with prefix
|
|
* @throws NullPointerException if prefix is null
|
|
* @see #regionMatches(boolean, int, String, int, int)
|
|
*/
|
|
public native boolean startsWith(String prefix, int toffset);
|
|
|
|
/**
|
|
* Predicate which determines if this String starts with a given prefix.
|
|
* If the prefix is an empty String, true is returned.
|
|
*
|
|
* @param prefex String to compare
|
|
* @return true if this String starts with the prefix
|
|
* @throws NullPointerException if prefix is null
|
|
* @see #startsWith(String, int)
|
|
*/
|
|
public boolean startsWith(String prefix)
|
|
{
|
|
return startsWith (prefix, 0);
|
|
}
|
|
|
|
/**
|
|
* Predicate which determines if this String ends with a given suffix.
|
|
* If the suffix is an empty String, true is returned.
|
|
*
|
|
* @param suffix String to compare
|
|
* @return true if this String ends with the suffix
|
|
* @throws NullPointerException if suffix is null
|
|
* @see #regionMatches(boolean, int, String, int, int)
|
|
*/
|
|
public boolean endsWith(String suffix)
|
|
{
|
|
return regionMatches (this.count - suffix.count, suffix, 0, suffix.count);
|
|
}
|
|
|
|
/**
|
|
* Computes the hashcode for this String. This is done with int arithmetic,
|
|
* where ** represents exponentiation, by this formula:<br>
|
|
* <code>s[0]*31**(n-1) + s[1]*31**(n-2) + ... + s[n-1]</code>.
|
|
*
|
|
* @return hashcode value of this String
|
|
*/
|
|
public native int hashCode();
|
|
|
|
/**
|
|
* Finds the first instance of a character in this String.
|
|
*
|
|
* @param ch character to find
|
|
* @return location (base 0) of the character, or -1 if not found
|
|
*/
|
|
public int indexOf(int ch)
|
|
{
|
|
return indexOf(ch, 0);
|
|
}
|
|
|
|
/**
|
|
* Finds the first instance of a character in this String, starting at
|
|
* a given index. If starting index is less than 0, the search
|
|
* starts at the beginning of this String. If the starting index
|
|
* is greater than the length of this String, -1 is returned.
|
|
*
|
|
* @param ch character to find
|
|
* @param fromIndex index to start the search
|
|
* @return location (base 0) of the character, or -1 if not found
|
|
*/
|
|
public native int indexOf(int ch, int fromIndex);
|
|
|
|
/**
|
|
* Finds the last instance of a character in this String.
|
|
*
|
|
* @param ch character to find
|
|
* @return location (base 0) of the character, or -1 if not found
|
|
*/
|
|
public int lastIndexOf(int ch)
|
|
{
|
|
return lastIndexOf(ch, count - 1);
|
|
}
|
|
|
|
/**
|
|
* Finds the last instance of a character in this String, starting at
|
|
* a given index. If starting index is greater than the maximum valid
|
|
* index, then the search begins at the end of this String. If the
|
|
* starting index is less than zero, -1 is returned.
|
|
*
|
|
* @param ch character to find
|
|
* @param fromIndex index to start the search
|
|
* @return location (base 0) of the character, or -1 if not found
|
|
*/
|
|
public native int lastIndexOf(int ch, int fromIndex);
|
|
|
|
/**
|
|
* Finds the first instance of a String in this String.
|
|
*
|
|
* @param str String to find
|
|
* @return location (base 0) of the String, or -1 if not found
|
|
* @throws NullPointerException if str is null
|
|
*/
|
|
public int indexOf(String str)
|
|
{
|
|
return indexOf(str, 0);
|
|
}
|
|
|
|
/**
|
|
* Finds the first instance of a String in this String, starting at
|
|
* a given index. If starting index is less than 0, the search
|
|
* starts at the beginning of this String. If the starting index
|
|
* is greater than the length of this String, -1 is returned.
|
|
*
|
|
* @param str String to find
|
|
* @param fromIndex index to start the search
|
|
* @return location (base 0) of the String, or -1 if not found
|
|
* @throws NullPointerException if str is null
|
|
*/
|
|
public native int indexOf(String str, int fromIndex);
|
|
|
|
/**
|
|
* Finds the last instance of a String in this String.
|
|
*
|
|
* @param str String to find
|
|
* @return location (base 0) of the String, or -1 if not found
|
|
* @throws NullPointerException if str is null
|
|
*/
|
|
public int lastIndexOf(String str)
|
|
{
|
|
return lastIndexOf(str, count - str.count);
|
|
}
|
|
|
|
/**
|
|
* Finds the last instance of a String in this String, starting at
|
|
* a given index. If starting index is greater than the maximum valid
|
|
* index, then the search begins at the end of this String. If the
|
|
* starting index is less than zero, -1 is returned.
|
|
*
|
|
* @param str String to find
|
|
* @param fromIndex index to start the search
|
|
* @return location (base 0) of the String, or -1 if not found
|
|
* @throws NullPointerException if str is null
|
|
*/
|
|
public int lastIndexOf(String str, int fromIndex)
|
|
{
|
|
if (fromIndex >= count)
|
|
fromIndex = count - str.count;
|
|
for (;; --fromIndex)
|
|
{
|
|
if (fromIndex < 0)
|
|
return -1;
|
|
if (startsWith(str, fromIndex))
|
|
return fromIndex;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Creates a substring of this String, starting at a specified index
|
|
* and ending at the end of this String.
|
|
*
|
|
* @param begin index to start substring (base 0)
|
|
* @return new String which is a substring of this String
|
|
* @throws IndexOutOfBoundsException if begin < 0 || begin > length()
|
|
* (while unspecified, this is a StringIndexOutOfBoundsException)
|
|
*/
|
|
public String substring(int begin)
|
|
{
|
|
return substring(begin, count);
|
|
}
|
|
|
|
/**
|
|
* Creates a substring of this String, starting at a specified index
|
|
* and ending at one character before a specified index.
|
|
*
|
|
* @param begin index to start substring (inclusive, base 0)
|
|
* @param end index to end at (exclusive)
|
|
* @return new String which is a substring of this String
|
|
* @throws IndexOutOfBoundsException if begin < 0 || end > length()
|
|
* || begin > end (while unspecified, this is a
|
|
* StringIndexOutOfBoundsException)
|
|
*/
|
|
public native String substring(int beginIndex, int endIndex);
|
|
|
|
/**
|
|
* Creates a substring of this String, starting at a specified index
|
|
* and ending at one character before a specified index. This behaves like
|
|
* <code>substring(beginIndex, endIndex)</code>.
|
|
*
|
|
* @param beginIndex index to start substring (inclusive, base 0)
|
|
* @param endIndex index to end at (exclusive)
|
|
* @return new String which is a substring of this String
|
|
* @throws IndexOutOfBoundsException if begin < 0 || end > length()
|
|
* || begin > end
|
|
* @since 1.4
|
|
*/
|
|
public CharSequence subSequence(int beginIndex, int endIndex)
|
|
{
|
|
return substring(beginIndex, endIndex);
|
|
}
|
|
|
|
/**
|
|
* Concatenates a String to this String. This results in a new string unless
|
|
* one of the two originals is "".
|
|
*
|
|
* @param str String to append to this String
|
|
* @return newly concatenated String
|
|
* @throws NullPointerException if str is null
|
|
*/
|
|
public native String concat(String str);
|
|
|
|
/**
|
|
* Replaces every instance of a character in this String with a new
|
|
* character. If no replacements occur, this is returned.
|
|
*
|
|
* @param oldChar the old character to replace
|
|
* @param newChar the new character
|
|
* @return new String with all instances of oldChar replaced with newChar
|
|
*/
|
|
public native String replace(char oldChar, char newChar);
|
|
|
|
/**
|
|
* Test if this String matches a regular expression. This is shorthand for
|
|
* <code>{@link Pattern}.matches(regex, this)</code>.
|
|
*
|
|
* @param regex the pattern to match
|
|
* @return true if the pattern matches
|
|
* @throws NullPointerException if regex is null
|
|
* @throws PatternSyntaxException if regex is invalid
|
|
* @see Pattern#matches(String, CharSequence)
|
|
* @since 1.4
|
|
*/
|
|
public boolean matches(String regex)
|
|
{
|
|
return Pattern.matches(regex, this);
|
|
}
|
|
|
|
/**
|
|
* Replaces the first substring match of the regular expression with a
|
|
* given replacement. This is shorthand for <code>{@link Pattern}
|
|
* .compile(regex).matcher(this).replaceFirst(replacement)</code>.
|
|
*
|
|
* @param regex the pattern to match
|
|
* @param replacement the replacement string
|
|
* @return the modified string
|
|
* @throws NullPointerException if regex or replacement is null
|
|
* @throws PatternSyntaxException if regex is invalid
|
|
* @see #replaceAll(String, String)
|
|
* @see Pattern#compile(String)
|
|
* @see Pattern#matcher(CharSequence)
|
|
* @see Matcher#replaceFirst(String)
|
|
* @since 1.4
|
|
*/
|
|
public String replaceFirst(String regex, String replacement)
|
|
{
|
|
return Pattern.compile(regex).matcher(this).replaceFirst(replacement);
|
|
}
|
|
|
|
/**
|
|
* Replaces all matching substrings of the regular expression with a
|
|
* given replacement. This is shorthand for <code>{@link Pattern}
|
|
* .compile(regex).matcher(this).replaceAll(replacement)</code>.
|
|
*
|
|
* @param regex the pattern to match
|
|
* @param replacement the replacement string
|
|
* @return the modified string
|
|
* @throws NullPointerException if regex or replacement is null
|
|
* @throws PatternSyntaxException if regex is invalid
|
|
* @see #replaceFirst(String, String)
|
|
* @see Pattern#compile(String)
|
|
* @see Pattern#matcher(CharSequence)
|
|
* @see Matcher#replaceAll(String)
|
|
* @since 1.4
|
|
*/
|
|
public String replaceAll(String regex, String replacement)
|
|
{
|
|
return Pattern.compile(regex).matcher(this).replaceAll(replacement);
|
|
}
|
|
|
|
/**
|
|
* Split this string around the matches of a regular expression. Each
|
|
* element of the returned array is the largest block of characters not
|
|
* terminated by the regular expression, in the order the matches are found.
|
|
*
|
|
* <p>The limit affects the length of the array. If it is positive, the
|
|
* array will contain at most n elements (n - 1 pattern matches). If
|
|
* negative, the array length is unlimited, but there can be trailing empty
|
|
* entries. if 0, the array length is unlimited, and trailing empty entries
|
|
* are discarded.
|
|
*
|
|
* <p>For example, splitting "boo:and:foo" yields:<br>
|
|
* <table border=0>
|
|
* <th><td>Regex</td> <td>Limit</td> <td>Result</td></th>
|
|
* <tr><td>":"</td> <td>2</td> <td>{ "boo", "and:foo" }</td></tr>
|
|
* <tr><td>":"</td> <td>t</td> <td>{ "boo", "and", "foo" }</td></tr>
|
|
* <tr><td>":"</td> <td>-2</td> <td>{ "boo", "and", "foo" }</td></tr>
|
|
* <tr><td>"o"</td> <td>5</td> <td>{ "b", "", ":and:f", "", "" }</td></tr>
|
|
* <tr><td>"o"</td> <td>-2</td> <td>{ "b", "", ":and:f", "", "" }</td></tr>
|
|
* <tr><td>"o"</td> <td>0</td> <td>{ "b", "", ":and:f" }</td></tr>
|
|
* </table>
|
|
*
|
|
* <p>This is shorthand for
|
|
* <code>{@link Pattern}.compile(regex).split(this, limit)</code>.
|
|
*
|
|
* @param regex the pattern to match
|
|
* @param limit the limit threshold
|
|
* @return the array of split strings
|
|
* @throws NullPointerException if regex or replacement is null
|
|
* @throws PatternSyntaxException if regex is invalid
|
|
* @see Pattern#compile(String)
|
|
* @see Pattern#split(CharSequence, int)
|
|
* @since 1.4
|
|
*/
|
|
public String[] split(String regex, int limit)
|
|
{
|
|
return Pattern.compile(regex).split(this, limit);
|
|
}
|
|
|
|
/**
|
|
* Split this string around the matches of a regular expression. Each
|
|
* element of the returned array is the largest block of characters not
|
|
* terminated by the regular expression, in the order the matches are found.
|
|
* The array length is unlimited, and trailing empty entries are discarded,
|
|
* as though calling <code>split(regex, 0)</code>.
|
|
*
|
|
* @param regex the pattern to match
|
|
* @return the array of split strings
|
|
* @throws NullPointerException if regex or replacement is null
|
|
* @throws PatternSyntaxException if regex is invalid
|
|
* @see #split(String, int)
|
|
* @see Pattern#compile(String)
|
|
* @see Pattern#split(CharSequence, int)
|
|
* @since 1.4
|
|
*/
|
|
public String[] split(String regex)
|
|
{
|
|
return Pattern.compile(regex).split(this, 0);
|
|
}
|
|
|
|
/**
|
|
* Lowercases this String according to a particular locale. This uses
|
|
* Unicode's special case mappings, as applied to the given Locale, so the
|
|
* resulting string may be a different length.
|
|
*
|
|
* @param loc locale to use
|
|
* @return new lowercased String, or this if no characters were lowercased
|
|
* @throws NullPointerException if loc is null
|
|
* @see #toUpperCase(Locale)
|
|
* @since 1.1
|
|
*/
|
|
public native String toLowerCase(Locale locale);
|
|
|
|
/**
|
|
* Lowercases this String. This uses Unicode's special case mappings, as
|
|
* applied to the platform's default Locale, so the resulting string may
|
|
* be a different length.
|
|
*
|
|
* @return new lowercased String, or this if no characters were lowercased
|
|
* @see #toLowerCase(Locale)
|
|
* @see #toUpperCase()
|
|
*/
|
|
public String toLowerCase()
|
|
{
|
|
// The JDK is a bit confused about what to do here. If we pass in
|
|
// the default Locale then special Locale handling might be
|
|
// invoked. However, the docs also say that Character.toLowerCase
|
|
// rules here. We go with the latter.
|
|
return toLowerCase (null);
|
|
}
|
|
|
|
/**
|
|
* Uppercases this String according to a particular locale. This uses
|
|
* Unicode's special case mappings, as applied to the given Locale, so the
|
|
* resulting string may be a different length.
|
|
*
|
|
* @param loc locale to use
|
|
* @return new uppercased String, or this if no characters were uppercased
|
|
* @throws NullPointerException if loc is null
|
|
* @see #toLowerCase(Locale)
|
|
* @since 1.1
|
|
*/
|
|
public native String toUpperCase(Locale locale);
|
|
|
|
/**
|
|
* Uppercases this String. This uses Unicode's special case mappings, as
|
|
* applied to the platform's default Locale, so the resulting string may
|
|
* be a different length.
|
|
*
|
|
* @return new uppercased String, or this if no characters were uppercased
|
|
* @see #toUpperCase(Locale)
|
|
* @see #toLowerCase()
|
|
*/
|
|
public String toUpperCase()
|
|
{
|
|
// The JDK is a bit confused about what to do here. If we pass in
|
|
// the default Locale then special Locale handling might be
|
|
// invoked. However, the docs also say that Character.toLowerCase
|
|
// rules here. We go with the latter.
|
|
return toUpperCase (null);
|
|
}
|
|
|
|
/**
|
|
* Trims all characters less than or equal to <code>'\u0020'</code>
|
|
* (<code>' '</code>) from the beginning and end of this String. This
|
|
* includes many, but not all, ASCII control characters, and all
|
|
* {@link Character#whitespace(char)}.
|
|
*
|
|
* @return new trimmed String, or this if nothing trimmed
|
|
*/
|
|
public native String trim();
|
|
|
|
/**
|
|
* Returns this, as it is already a String!
|
|
*
|
|
* @return this
|
|
*/
|
|
public String toString()
|
|
{
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Copies the contents of this String into a character array. Subsequent
|
|
* changes to the array do not affect the String.
|
|
*
|
|
* @return character array copying the String
|
|
*/
|
|
public native char[] toCharArray();
|
|
|
|
/**
|
|
* Returns a String representation of an Object. This is "null" if the
|
|
* object is null, otherwise it is <code>obj.toString()</code> (which
|
|
* can be null).
|
|
*
|
|
* @param obj the Object
|
|
* @return the string conversion of obj
|
|
*/
|
|
public static String valueOf(Object obj)
|
|
{
|
|
return obj == null ? "null" : obj.toString();
|
|
}
|
|
|
|
/**
|
|
* Returns a String representation of a character array. Subsequent
|
|
* changes to the array do not affect the String.
|
|
*
|
|
* @param data the character array
|
|
* @return a String containing the same character sequence as data
|
|
* @throws NullPointerException if data is null
|
|
* @see #valueOf(char[], int, int)
|
|
* @see #String(char[])
|
|
*/
|
|
public static String valueOf(char[] data)
|
|
{
|
|
return valueOf (data, 0, data.length);
|
|
}
|
|
|
|
/**
|
|
* Returns a String representing the character sequence of the char array,
|
|
* starting at the specified offset, and copying chars up to the specified
|
|
* count. Subsequent changes to the array do not affect the String.
|
|
*
|
|
* @param data character array
|
|
* @param offset position (base 0) to start copying out of data
|
|
* @param count the number of characters from data to copy
|
|
* @return String containing the chars from data[offset..offset+count]
|
|
* @throws NullPointerException if data is null
|
|
* @throws IndexOutOfBoundsException if (offset < 0 || count < 0
|
|
* || offset + count > data.length)
|
|
* (while unspecified, this is a StringIndexOutOfBoundsException)
|
|
* @see #String(char[], int, int)
|
|
*/
|
|
public static native String valueOf(char[] data, int offset, int count);
|
|
|
|
/**
|
|
* Returns a String representing the character sequence of the char array,
|
|
* starting at the specified offset, and copying chars up to the specified
|
|
* count. Subsequent changes to the array do not affect the String.
|
|
*
|
|
* @param data character array
|
|
* @param offset position (base 0) to start copying out of data
|
|
* @param count the number of characters from data to copy
|
|
* @return String containing the chars from data[offset..offset+count]
|
|
* @throws NullPointerException if data is null
|
|
* @throws IndexOutOfBoundsException if (offset < 0 || count < 0
|
|
* || offset + count > data.length)
|
|
* (while unspecified, this is a StringIndexOutOfBoundsException)
|
|
* @see #String(char[], int, int)
|
|
*/
|
|
public static String copyValueOf(char[] data, int offset, int count)
|
|
{
|
|
String r = new String ();
|
|
r.init(data, offset, count, false);
|
|
return r;
|
|
}
|
|
|
|
/**
|
|
* Returns a String representation of a character array. Subsequent
|
|
* changes to the array do not affect the String.
|
|
*
|
|
* @param data the character array
|
|
* @return a String containing the same character sequence as data
|
|
* @throws NullPointerException if data is null
|
|
* @see #copyValueOf(char[], int, int)
|
|
* @see #String(char[])
|
|
*/
|
|
public static String copyValueOf(char[] data)
|
|
{
|
|
return copyValueOf (data, 0, data.length);
|
|
}
|
|
|
|
/**
|
|
* Returns a String representing a boolean.
|
|
*
|
|
* @param b the boolean
|
|
* @return "true" if b is true, else "false"
|
|
*/
|
|
public static String valueOf(boolean b)
|
|
{
|
|
return b ? "true" : "false";
|
|
}
|
|
|
|
/**
|
|
* Returns a String representing a character.
|
|
*
|
|
* @param c the character
|
|
* @return String containing the single character c
|
|
*/
|
|
public static native String valueOf(char c);
|
|
|
|
/**
|
|
* Returns a String representing an integer.
|
|
*
|
|
* @param i the integer
|
|
* @return String containing the integer in base 10
|
|
* @see Integer#toString(int)
|
|
*/
|
|
public static native String valueOf(int i);
|
|
|
|
/**
|
|
* Returns a String representing a long.
|
|
*
|
|
* @param l the long
|
|
* @return String containing the long in base 10
|
|
* @see Long#toString(long)
|
|
*/
|
|
public static String valueOf(long l)
|
|
{
|
|
return Long.toString(l);
|
|
}
|
|
|
|
/**
|
|
* Returns a String representing a float.
|
|
*
|
|
* @param f the float
|
|
* @return String containing the float
|
|
* @see Float#toString(float)
|
|
*/
|
|
public static String valueOf(float f)
|
|
{
|
|
return Float.toString(f);
|
|
}
|
|
|
|
/**
|
|
* Returns a String representing a double.
|
|
*
|
|
* @param d the double
|
|
* @return String containing the double
|
|
* @see Double#toString(double)
|
|
*/
|
|
public static String valueOf(double d)
|
|
{
|
|
return Double.toString(d);
|
|
}
|
|
|
|
/**
|
|
* Fetches this String from the intern hashtable. If two Strings are
|
|
* considered equal, by the equals() method, then intern() will return the
|
|
* same String instance. ie. if (s1.equals(s2)) then
|
|
* (s1.intern() == s2.intern()). All string literals and string-valued
|
|
* constant expressions are already interned.
|
|
*
|
|
* @return the interned String
|
|
*/
|
|
public native String intern();
|
|
|
|
|
|
private native void init(char[] chars, int offset, int count,
|
|
boolean dont_copy);
|
|
private native void init(byte[] chars, int hibyte, int offset, int count);
|
|
private native void init(byte[] chars, int offset, int count, String enc)
|
|
throws UnsupportedEncodingException;
|
|
private static native void rehash();
|
|
}
|