build.xml

<?xml version="1.0" encoding="UTF-8"?>

<project name="ant_simple_compile" default="all">
    <property name="src" value="src"/>
    <property name="build" value="build"/>
    <property name="main.build.dir" value="${build}/main"/>
    <property name="main.build.dir.classes" value="${main.build.dir}/classes"/>
    <property name="main.src.dir" value="${src}/main/java"/>
    <property name="test.build.dir" value="${build}/test"/>
    <property name="test.build.dir.classes" value="${test.build.dir}/classes"/>
    <property name="test.src.dir" value="${src}/test/java"/>
    <property name="main.class" value="com.hello.HelloWorld"/>
    <property name="lib" value="lib"/>

    <path id="classpath.test">
        <pathelement location="${lib}/junit-4.12.jar"/>
        <pathelement location="${lib}/hamcrest-core-1.3.jar"/>
        <pathelement location="${main.build.dir.classes}"/>
    </path>

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

    <target name="test-compile" depends="compile">
        <mkdir dir="${test.build.dir.classes}"/>
        <javac srcdir="${test.src.dir}" destdir="${test.build.dir.classes}" includeantruntime="false">
            <classpath refid="classpath.test"/>
        </javac>
    </target>

    <target name="test" depends="test-compile">
        <junit printsummary="on" haltonfailure="yes" fork="true">
            <classpath>
                <path refid="classpath.test"/>
                <pathelement location="${test.build.dir.classes}"/>
            </classpath>
            <formatter type="brief" usefile="false" />
            <batchtest>
                <fileset dir="${test.src.dir}" includes="**/*Test.java" />
            </batchtest>
        </junit>
    </target>

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

    <target name="all" depends="package">
    </target>

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

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