build.xml

<project name="mathexpr" default="main" basedir=".">
	<description>
		Math Expresion Evaluator/Interpreter
	</description>
	
	<property name="src" location="src"/>
	<property name="build" location="bin"/>
	<property name="dist" location="dist"/>

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

	<target name="makedir">
		<mkdir dir="${build}" />
		<mkdir dir="${dist}" />
	</target>

	<target name="compile" depends="clean, makedir">
		<javac srcdir="${src}" destdir="${build}" />
	</target>

	<target name="jar" depends="compile">
		<jar destfile="${dist}\de.codefionn.mathexpr.jar" basedir="${build}">
			<manifest>
				<attribute name="Main-Class" value="de.codefionn.mathexpr.ProgramMain"/>
			</manifest>
		</jar>
	</target>

	<target name="main" depends="compile, jar">
		<description>Main target</description>
	</target>
</project>