checkboxes.java

来自「Java编程思想第三版,作者书中全部原代码,」· Java 代码 · 共 49 行

//: c14:CheckBoxes.java
// Using JCheckBoxes.
// <applet code=CheckBoxes width=200 height=200></applet>
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import com.bruceeckel.swing.*;

public class CheckBoxes extends JApplet {
  private JTextArea t = new JTextArea(6, 15);
  private JCheckBox
    cb1 = new JCheckBox("Check Box 1"),
    cb2 = new JCheckBox("Check Box 2"),
    cb3 = new JCheckBox("Check Box 3");
  public void init() {
    cb1.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        trace("1", cb1);
      }
    });
    cb2.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        trace("2", cb2);
      }
    });
    cb3.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        trace("3", cb3);
      }
    });
    Container cp = getContentPane();
    cp.setLayout(new FlowLayout());
    cp.add(new JScrollPane(t));
    cp.add(cb1);
    cp.add(cb2);
    cp.add(cb3);
  }
  private void trace(String b, JCheckBox cb) {
    if(cb.isSelected())
      t.append("Box " + b + " Set\n");
    else
      t.append("Box " + b + " Cleared\n");
  }
  public static void main(String[] args) {
    Console.run(new CheckBoxes(), 200, 200);
  }
} ///:~