Get a Swing GUI up and running. (Handy for testing swing components.)

MyClass.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class MyClass {

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container contentPane = frame.getContentPane();
        contentPane.setLayout( ... );
        contentPane.add( ... );
        f.pack();
        f.setVisible(true);
    }
}