radiobuttonsample.java

The Definitive Guide to Java Swing, Third Edition by John Zukowski (Author) 源码

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

public class RadioButtonSample {
  static Icon threeIcon = new ImageIcon("3.gif");
  static Icon fourIcon = new ImageIcon("4.gif");
  static Icon fiveIcon = new ImageIcon("5.gif");
  static Icon sixIcon = new ImageIcon("6.gif");

  public static class ButtionActionListener implements ActionListener {
      public void actionPerformed (ActionEvent actionEvent) {
        AbstractButton aButton = (AbstractButton)actionEvent.getSource();
        boolean selected = aButton.getModel().isSelected();
        System.out.println (actionEvent.getActionCommand() +
          " - selected? " + selected);
      }
  }

  public static class ButtonItemListener implements ItemListener {
      public void itemStateChanged(ItemEvent itemEvent) {
        AbstractButton aButton = (AbstractButton)itemEvent.getSource();
        int state = itemEvent.getStateChange();
        String selected = 
          ((state == ItemEvent.SELECTED) ? "selected" : "not selected");
        System.out.println (aButton.getText() + " - selected? " + selected);
      }
  }

  public static void main(String args[]) {

    Runnable runner = new Runnable() {
      public void run() {

        final ActionListener actionListener = new ButtionActionListener();
        final ItemListener itemListener = new ButtonItemListener();

        JFrame frame = new JFrame("Radio Menu Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JMenuBar menuBar = new JMenuBar();
        JMenu menu = new JMenu("Menu");
        ButtonGroup buttonGroup = new ButtonGroup();
        menu.setMnemonic(KeyEvent.VK_M);

        JRadioButtonMenuItem emptyMenuItem = 
          new JRadioButtonMenuItem();
        emptyMenuItem.setActionCommand("Empty");
        emptyMenuItem.addActionListener(actionListener);
        buttonGroup.add(emptyMenuItem);
        menu.add(emptyMenuItem);

        JRadioButtonMenuItem oneMenuItem = 
          new JRadioButtonMenuItem("Partridge");
        oneMenuItem.addActionListener(actionListener);
        buttonGroup.add(oneMenuItem);
        menu.add(oneMenuItem);

        JRadioButtonMenuItem twoMenuItem = 
          new JRadioButtonMenuItem("Turtle Doves", true);
        twoMenuItem.addActionListener(actionListener);
        buttonGroup.add(twoMenuItem);
        menu.add(twoMenuItem);

        JRadioButtonMenuItem threeMenuItem = 
          new JRadioButtonMenuItem("French Hens", threeIcon);
        threeMenuItem.addItemListener(itemListener);
        buttonGroup.add(threeMenuItem);
        menu.add(threeMenuItem);

        JRadioButtonMenuItem fourMenuItem = 
          new JRadioButtonMenuItem("Calling Birds", fourIcon, true);
        fourMenuItem.addActionListener(actionListener);
        buttonGroup.add(fourMenuItem);
        menu.add(fourMenuItem);

        JRadioButtonMenuItem fiveMenuItem = 
          new JRadioButtonMenuItem(fiveIcon);
        fiveMenuItem.addActionListener(actionListener);
        fiveMenuItem.setActionCommand("Rings");
        buttonGroup.add(fiveMenuItem);
        menu.add(fiveMenuItem);

        JRadioButtonMenuItem sixMenuItem = 
          new JRadioButtonMenuItem(sixIcon, true);
        sixMenuItem.addActionListener(actionListener);
        sixMenuItem.setActionCommand("Geese");
        buttonGroup.add(sixMenuItem);
        menu.add(sixMenuItem);

        menuBar.add(menu);
        frame.setJMenuBar(menuBar);
        frame.setSize(350, 250);
        frame.setVisible(true);
      }
    };
    EventQueue.invokeLater(runner);
  }
}