Basic ant build file

build.xml

<?xml version="1.0"?>
<project name="Your Project Name" default="compile" basedir=".">
	
	<property name="src" value="src"/>
	<property name="lib" value="lib"/>
	<property name="build" value="build"/>
	
	<path id="classpath.base">
		<pathelement location=""/>
		<pathelement location=""/>
		<pathelement location=""/>
	</path>
	
	<target name="init">
		<mkdir dir="${build}"/>
	</target>
	
	<target name="compile">
		<javac srcdir="${src}" destdir="${build}">
			<classpath refid="classpath.base"/>
		</javac>
	</target>	
	
</project>