Howto :

1. Create a Directory where you will build and will also contain java src file
2. Create all source files (extension = .java)
3. Example here uses Hello.java (Simple Hello World program which also dumps command line arguments)

// Hello.java
 
import java.io.*;
 
public class Hello
{
   public static void main (String[] argv)
   {
      System.out.print("Hello world");
          if (argv.length > 0)
          {
                System.out.println("Argument[0] = "+argv[0]);
          }
   }
}

<project default="compile">
  <target name="compile">
    <javac srcdir="." />
  </target>
 
  <target name="jar" depends="compile">
    <jar destfile="Hello.jar"
         basedir="."
         includes="**/*.class"
         />
  </target>
 
  <target name="run" depends="jar">
    <java classname="Hello"
          classpath="Hello.jar"
          fork="true"
          />
  </target>
</project>

1. ant compile
2. ant run

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