build.xml

<project name="ga_face_generator" basedir="." default="main">
  <property name="dir.src"     value="src"/>
  <property name="dir.build"   value="build"/>
  <property name="dir.classes" value="${dir.build}/classes"/>
  <property name="dir.jar"     value="${dir.build}/jar"/>

  <property name="main-class"  value="ch.muriz.gaface.FaceGen"/>

  <target name="clean">
    <delete dir="${dir.build}"/>
  </target>

  <target name="compile">
    <mkdir dir="${dir.classes}"/>
    <javac srcdir="${dir.src}" destdir="${dir.classes}"/>
  </target>

  <target name="jar" depends="compile">
    <mkdir dir="${dir.jar}"/>
    <jar destfile="${dir.jar}/${ant.project.name}.jar" basedir="${dir.classes}">
      <manifest>
        <attribute name="Main-Class" value="${main-class}"/>
      </manifest>
    </jar>
  </target>

  <target name="run" depends="jar">
    <java jar="${dir.jar}/${ant.project.name}.jar" fork="true"/>
  </target>

  <target name="clean-build" depends="clean,jar"/>
  <target name="main" depends="clean,run"/>
</project>