build.xml

<project name="ArcherGame" default="jarfile">

  <!-- Initialise build properties  -->
  <target name="init" description="Initialises properties">
    <property name="project.name" value="ArcherGame" />
    <property name="src.dir" value="src" />
    <property name="main.class" value="ArcherGame/Main.java" />
    <property name="build.dir" value="build" />
    <property name="classes.dir" value="ArcherGame/build/classes" />
    <property name="lib.dir" value="lib" />
    <path id="classpath">
      <fileset dir="lib" includes="**/*.jar" />
    </path>
  </target>

  <!-- Creates the build directories to hold JAR and Class files -->
  <target name="prepare" description="Creates the build and classes directories" depends="init">
    <mkdir dir="ArcherGame/build/classes" />
  </target>

  <!-- Removes the build directory -->
  <target name="clean" description="Clean up project" depends="init">
    <delete dir="ArcherGame/build" />
  </target>

  <!-- Compiles the source code -->
  <target name="compile" description="Compiles the source code" depends="prepare">
    <javac srcdir="${src.dir}" destdir="ArcherGame/build/classes">
      <classpath>
        <fileset dir="lib" includes="**/*.jar" />
      </classpath>
    </javac>
  </target>

  <!-- Creates a JAR file -->
  <target name="jarfile" description="Archives the code" depends="compile">
    <jar destfile="build/ArcherGame.jar" basedir="ArcherGame/build/classes">
      <manifest>
        <attribute name="Main-Class" value="${main.class}" />
        <attribute name="Class-Path" value="${lib.dir}" />
      </manifest>
      <zipgroupfileset dir="lib" includes="*.jar"/>
    </jar> <!-- A <zipgroupfileset> allows for multiple zip files to be merged into the archive -->
  </target>
</project>