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

public class ShowDiagonalLayout extends JApplet {
  private FlowLayout flowLayout = new FlowLayout();
  private GridLayout gridLayout = new GridLayout(2, 2);
  private DiagonalLayout diagonalLayout = new DiagonalLayout();

  private JButton jbt1 = new JButton("Button 1");
  private JButton jbt2 = new JButton("Button 2");
  private JButton jbt3 = new JButton("Button 3");
  private JButton jbt4 = new JButton("Button 4");

  private JRadioButton jrbFlowLayout =
    new JRadioButton("FlowLayout");
  private JRadioButton jrbGridLayout =
    new JRadioButton("GridLayout");
  private JRadioButton jrbDiagonalLayout =
    new JRadioButton("DiagonalLayout", true);

  private JPanel jPanel2 = new JPanel();

  public ShowDiagonalLayout() {
    // Set default layout in jPanel2
    jPanel2.setLayout(diagonalLayout);
    jPanel2.add(jbt1);
    jPanel2.add(jbt2);
    jPanel2.add(jbt3);
    jPanel2.add(jbt4);
    jPanel2.setBorder(new LineBorder(Color.black));

    JPanel jPanel1 = new JPanel();
    jPanel1.setBorder(new TitledBorder("Select a Layout Manager"));
    jPanel1.add(jrbFlowLayout);
    jPanel1.add(jrbGridLayout);
    jPanel1.add(jrbDiagonalLayout);

    ButtonGroup buttonGroup1 = new ButtonGroup();
    buttonGroup1.add(jrbFlowLayout);
    buttonGroup1.add(jrbGridLayout);
    buttonGroup1.add(jrbDiagonalLayout);

    add(jPanel1, BorderLayout.SOUTH);
    add(jPanel2, BorderLayout.CENTER);

    jrbFlowLayout.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jPanel2.setLayout(flowLayout);
        jPanel2.validate();
      }
    });
    jrbGridLayout.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jPanel2.setLayout(gridLayout);
        jPanel2.validate();
      }
    });
    jrbDiagonalLayout.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jPanel2.setLayout(diagonalLayout);
        jPanel2.validate();
      }
    });
  }

  public static void main(String[] args) {
    ShowDiagonalLayout applet = new ShowDiagonalLayout();
    JFrame frame = new JFrame();
    //EXIT_ON_CLOSE == 3
    frame.setDefaultCloseOperation(3);
    frame.setTitle("ShowDiagonalLayout");
    frame.getContentPane().add(applet, BorderLayout.CENTER);
    applet.init();
    applet.start();
    frame.setSize(400,320);
    Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
    frame.setLocation((d.width - frame.getSize().width) / 2,
      (d.height - frame.getSize().height) / 2);
    frame.setVisible(true);
  }
}