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README |
README
This directory contains example programs that show how the GNU Classpath library can be used. Each example has its own package under gnu.classpath.examples and has a class Demo which contains a main() method to run that particular example. The examples can be compiled and run with gcj as follows: gcj -o swingdemo --main=gnu.classpath.examples.swing.Demo \ gnu/classpath/examples/swing/Demo.java \ gnu/classpath/examples/swing/GNULookAndFeel.java ./swingdemo Or with a traditional byte code interpreter like: gcj -C gnu/classpath/examples/awt/Demo.java gij gnu.classpath.examples.awt.Demo The installation also comes with an examples.zip archive that contains all needed resources and compiled byte code class files that can be run as follows: kaffe -classpath examples.zip gnu.classpath.examples.awt.Demo kaffe -classpath examples.zip gnu.classpath.examples.swing.Demo The jawt Demo needs some extra support library that currently needs to be build by hand. The following assumes GNU Classpath was installed in /usr/local/classpath, if you installed it somewhere else then adjust the -I and -L paths accordingly. The included Makefile.jawt is setup this way. You can invoke it with: make -f Makefile.jawt Or you can compile by hand as follows: gcj -C gnu/classpath/examples/jawt/DemoJAWT.java gcjh -jni gnu.classpath.examples.jawt.DemoJAWT -o DemoJAWT.h gcc -g -O0 -Wall -I. -I/usr/X11R6/include -L. -L/usr/X11R6/lib \ -I/usr/local/classpath/include -L/usr/local/classpath/lib/classpath \ -lX11 -ljawtgnu -shared -o libDemoJAWT.so \ gnu/classpath/examples/jawt/DemoJAWT.c You can then run the example as follows: export LD_LIBRARY_PATH=.:/usr/local/classpath/lib/classpath jamvm gnu.classpath.examples.jawt.DemoJAWT The java2d benchmarking demos include a GTK widget to measure the native speed of some basic java2d options, without the JNI overhead. You can invoke it with: make -f Makefile.java2d Or you can compile by hand as follows: gcc -g -O0 -Wall -I./gnu/classpath/examples/java2d \ -o cairobench gnu/classpath/examples/java2d/bench.c \ `pkg-config --libs --cflags gtk+-2.0` You can then run the example as follows: ./cairobench All example code is distributed under the GNU General Public License (GPL). The example icons used in some of the examples come from gnome-icon-theme version 1.2.3 and are also distributed under the GPL. All these images are stored in the directory gnu/classpath/examples/icons/. More free icons can be found in the gnome-icon-theme package: http://ftp.gnome.org/pub/GNOME/sources/gnome-icon-theme/ GNU Classpath examples are free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Classpath examples are distributed in the hope that they will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Classpath examples; see the file COPYING. If not, write to the Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.