build.xml

<?xml version="1.0" encoding="UTF-8" ?>
<project name="AntDemo" default="test" basedir=".">
<property name="src" value="src"/>
<property name="dest" value="classes"/>
<property name="helloant_jar" value="helloant.jar"/>
<target name="init">
   <mkdir dir="${dest}"/>
</target>
<target name="compile" depends="init">
   <javac srcdir="${src}" destdir="${dest}"/>
</target>
<target name="build" depends="compile">
   <jar jarfile="${helloant_jar}" basedir="${dest}"/>
</target>
<target name="test" depends="build">
   <java classname="hello" classpath="${helloant_jar}"/>
</target>
<target name="clean">
   <delete dir="${dest}" />
   <delete file="${helloant_jar}" />
</target>
<target name="rerun" depends="clean,test">
   <ant target="clean" />
   <ant target="test" />
</target>
</project>