Swing Hello,World

SwingHelloWorld.java

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;

public class SwingHelloWorld extends JFrame{
  public static void main(String[] args){
    SwingHelloWorld frame = new SwingHelloWorld("Hello");
    frame.setVisible(true);
  }

  SwingHelloWorld(String title){
    setTitle(title);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JPanel panel = new JPanel();
    JLabel label1 = new JLabel("Hello, World");

    panel.add(label1);

    getContentPane().add(panel);
  }
}