import javax.swing.*;                                   
public class HelloFrame extends JFrame                   
{
    public static void main(String[] args)               
    {
        new HelloFrame();                                
    }

    public HelloFrame()                                  
    {
        this.setSize(200,100);                          
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setTitle("Hello World!");                   
        this.setVisible(true);                           
    }
}