We would like to know how to import java.awt.Frame;.
// ww w. j ava 2s. c o m import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.WindowConstants; public class Main { public static void main(String args[]) throws Exception { final JFrame frame = new JFrame(); frame.setUndecorated(true); JButton button = new JButton("Minimize"); button.addActionListener(e -> frame.setState(Frame.ICONIFIED)); frame.add(button); frame.pack(); frame.setVisible(true); frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); } }