Simple Ant build file.

build.xml

<!--

Directory structure:

	.
	├── build.xml
	├── libs
	└── src
	    └── foo
	        └── bar
	            └── baz
	                └── qux

-->
<project name="Foobar" default="cleanrun" basedir=".">
	<!-- Set global properties -->
	<property name="srcdir" location="src"   />
	<property name="libs"   location="libs"  />
	<property name="dist"   location="dist"  />
	<property name="build"  location="build" />
	<path id="libs">
		<fileset dir="${libs}">
			<include name="**/*.jar" />
		</fileset>
	</path>
	<target name="init">
		<tstamp />
		<mkdir dir="${build}" />
		<mkdir dir="${dist}"  />
	</target>
	<!-- Compile all the things -->
	<target name="compile" depends="init" description="Compile all the Java files and put them into a JAR.">
		<javac includeantruntime="false" srcdir="${srcdir}" destdir="${build}" debug="true">
			<classpath refid="libs" />
			<compilerarg value="-Xlint:all" />
		</javac>
		<jar jarfile="${dist}/${ant.project.name}-${DSTAMP}.jar" basedir="${build}">
			<zipgroupfileset dir="${libs}" includes="**/*.jar" />
			<manifest>
				<attribute name="Main-Class" value="foo.bar.baz.qux.MainClassName" />
			</manifest>
		</jar>
	</target>
	<target name="cleanrun" depends="compile" description="Run the compiled JAR file.">
		<delete dir="${build}" />
		<java jar="${dist}/${ant.project.name}-${DSTAMP}.jar" fork="true" />
	</target>
</project>