Example of using Swing

import javax.swing.JFrame;import javax.swing.JLabel;
public final class HelloWorld extends JFrame {private HelloWorld() {setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);getContentPane().add(new JLabel("Hello, World!"));pack();setLocationRelativeTo(null);}
public static void main(String[] args) {new HelloWorld().setVisible(true);}}