ANT build sample.

build.xml

<project name="example-build" default="run" basedir=".">

   <property name="src" location="src"/>            
   <property name="build" location="build"/>        
   <property name="dist" location="dist"/>          
   <property name="version" value="1.0"/>           
   <property name="main" value="HelloWorld"/>

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

   <target name="compile" depends="init" description="compile the source">
      <javac srcdir="${src}" destdir="${build}" includeantruntime="false"/>            
   </target>

   <target name="dist" depends="compile" description="generate the distribution">
      <mkdir dir="${dist}"/>                           

      <jar jarfile="${dist}/my-app-${version}.jar" basedir="${build}">

	     <manifest>
                <attribute name="Manifest-Version" value="1.0"/>
                <attribute name="Ant-Version" value="Apache Ant 1.8.3"/>
                <attribute name="Main-Class" value="${main}"/>
                <attribute name="Class-Path" value="${main}"/>
            </manifest>
      </jar>	
   </target>

    <target name="run" depends="dist">
        <java jar="${dist}/my-app-${version}.jar" fork="true"/>
    </target>

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

HelloWorld.java

//In src folder
public class HelloWorld {

	public static void main(String[] args) {

		System.out.println("Hello World!");

	}
}

HowToRun.txt

(0) Install Java, ANT
(1) Make a folder with any name
(2) Make a "src" folder inside the folder you just created
(3) Make a "HelloWorld.java" as above in "src" folder
(4) Launch terminal and goto the folder you created
(5) Try command "ant" OR "ant run" OR "ant compile" ....