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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.