488d42af6f
* Makefile.am: Add HashSet.java and java/lang/ref classes. Remove BasicMapEntry.java and Bucket.java. * Makefile.in: Rebuilt. * java/util/HashMap.java: Rewritten. * java/util/HashSet.java: Imported from classpath. * java/util/WeakHashMap.java: Imported from classpath. * java/util/Hashtable.java: Rewritten based on new HashMap code. * java/util/Bucket.java: Deleted. * java/util/BasicMapEntry.java: Deleted. * java/util/Collections.java (search): Use a for-loop, not iterator hasNext(). (copy): Use a for-loop. Throw an IndexOutOfBoundsException if run out of elements in source. (max): Use a for-loop. (min): Ditto. (reverse): Keep track of positions instead of using Iterator's nextIndex() and previousIndex(). (shuffle(List)): Initialize defaultRandom if required using double-check thread safety idiom. Call two-argument shuffle method using defaultRandom. (defaultRandom): New field. (shuffle(List, Random)): Use a for-loop. Keep track of pos instead of using previousIndex() and nextIndex(). (singletonMap(iterator)): Use a HashMap.Entry, not BasicMapEntry. * java/util/AbstractCollection.java (toString): Use a StringBuffer. * java/util/AbstractMap.java (toString): Use StringBuffer. * java/lang/ref/PhantomReference.java: Imported from classpath. * java/lang/ref/SoftReference.java: Ditto. * java/lang/ref/Reference.java: Ditto. * java/lang/ref/WeakReference.java: Ditto. * java/lang/ref/ReferenceQueue.java: Ditto. From-SVN: r38183
69 lines
2.3 KiB
Java
69 lines
2.3 KiB
Java
/* java.lang.ref.WeakReference
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Copyright (C) 1999 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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As a special exception, if you link this library with other files to
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produce an executable, this library does not by itself cause the
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resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why the
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executable file might be covered by the GNU General Public License. */
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package java.lang.ref;
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/**
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* A weak reference will be cleared, if the object is only weakly
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* reachable. It is useful for lookup tables, where you aren't
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* interested in an entry, if the key isn't reachable anymore.
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* <code>WeakHashtable</code> is a complete implementation of such a
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* table. <br>
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*
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* It is also useful to make objects unique: You create a set of weak
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* references to those objects, and when you create a new object you
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* look in this set, if the object already exists and return it. If
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* an object is not referenced anymore, the reference will
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* automatically cleared, and you may remove it from the set. <br>
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*
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* @author Jochen Hoenicke
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* @see java.util.WeakHashtable
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*/
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public class WeakReference
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extends Reference
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{
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/**
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* Create a new weak reference, that is not registered to any queue.
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* @param referent the object we refer to.
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*/
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public WeakReference(Object referent)
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{
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super(referent);
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}
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/**
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* Create a new weak reference.
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* @param referent the object we refer to.
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* @param q the reference queue to register on.
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* @exception NullPointerException if q is null.
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*/
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public WeakReference(Object referent, ReferenceQueue q)
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{
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super(referent, q);
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}
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}
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