root/java-aspect-ratio-container/build.xml

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<project basedir="." default="build" name="AspectRatio">
    <target name="clean">
        <delete dir="classes"/>
    </target>
    <target name="build">
        <mkdir dir="classes"/>
        <javac debug="true" destdir="classes">
            <src path="."/>
        </javac>
    </target>
    <target name="run" depends="build">
        <java classpath="classes" 
            classname="net.landschoff.example.AspectRatio" 
            fork="true" spawn="true" />
    </target>
</project>