radiobuttons.java

来自「java编程思想(第四版)书中原代码 ,对初学者很有用的东西」· Java 代码 · 共 37 行

//: gui/RadioButtons.java
// Using JRadioButtons.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import static net.mindview.util.SwingConsole.*;

public class RadioButtons extends JFrame {
  private JTextField t = new JTextField(15);
  private ButtonGroup g = new ButtonGroup();
  private JRadioButton
    rb1 = new JRadioButton("one", false),
    rb2 = new JRadioButton("two", false),
    rb3 = new JRadioButton("three", false);
  private ActionListener al = new ActionListener() {
    public void actionPerformed(ActionEvent e) {
      t.setText("Radio button " +
        ((JRadioButton)e.getSource()).getText());
    }
  };
  public RadioButtons() {
    rb1.addActionListener(al);
    rb2.addActionListener(al);
    rb3.addActionListener(al);
    g.add(rb1); g.add(rb2); g.add(rb3);
    t.setEditable(false);
    setLayout(new FlowLayout());
    add(t);
    add(rb1);
    add(rb2);
    add(rb3);
  }
  public static void main(String[] args) {
    run(new RadioButtons(), 200, 125);
  }
} ///:~