testcardlayout.java

Java程序设计实用教程源代码 本书源代码按章分别放置在不同的文件夹中,所有程序均在JDK1.6环境下编译运行正常,除了第13章需要建立ODBC数据源之外,其他程序只要有Java运行环境即可直接运行

import java.awt.*;
import java.awt.event.*;
import javax.swing.*; 
public class testCardLayout extends JFrame implements ActionListener {
  Container contentPane;
  JPanel jpanel = new JPanel();
  CardLayout card = new CardLayout(); //CardLayout对象
  JButton jbtn[];
  String cards[] = {"第一张卡片", "下一张卡片", "上一张卡片", "最后一张卡片"};
  public testCardLayout() {
    super("CardLayout");
    contentPane = this.getContentPane();
    jpanel.setLayout(card); //设置内容格的布局
    JPanel card1 = new JPanel(); //定义第一张卡片
    JLabel jlabel1 = new JLabel("卡片一"); //上面仅有一个标签
    card1.add(jlabel1);
    jpanel.add(card1, jlabel1.getText()); //将第一张卡片加入jpanel面板
    JPanel card2 = new JPanel(); //定义第2张卡片
    JTextField field = new JTextField("卡片二");
    card2.add(field);
    jpanel.add(card2, field.getText()); //将第二张卡片加入jpanel面板
    JPanel card3 = new JPanel(); //定义第三张卡片
    JLabel jlabel3 = new JLabel("卡片三");
    card3.setLayout(new BorderLayout());
    card3.add(new JButton("北"), BorderLayout.NORTH);
    card3.add(new JButton("南"), BorderLayout.SOUTH);
    card3.add(new JButton("西"), BorderLayout.WEST);
    card3.add(new JButton("东"), BorderLayout.EAST);
    card3.add(jlabel3, BorderLayout.CENTER);
    jpanel.add(card3, jlabel3.getText()); //将第三张卡片加入jpanel面板
    JPanel controls = new JPanel(); //创建控制面板
    controls.setLayout(new GridLayout(2, 2));
    jbtn = new JButton[cards.length];
    for (int i = 0; i < cards.length; i++) {
      jbtn[i] = new JButton(cards[i]);
      jbtn[i].addActionListener(this);
      controls.add(jbtn[i]); //将按钮加入controls面板
    }
    contentPane.add(controls, BorderLayout.WEST); 
    contentPane.add(jpanel, BorderLayout.EAST);
    setSize(350, 200);
    setVisible(true);
    addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
  }
  public void actionPerformed(ActionEvent evt) {
    if (evt.getSource() == jbtn[0]) //显示第一张卡片
      card.first(jpanel);
    else if (evt.getSource() == jbtn[1]) //显示下一张卡片
      card.next(jpanel);
    else if (evt.getSource() == jbtn[2]) //显示前一张卡片
      card.previous(jpanel);
    else if (evt.getSource() == jbtn[3]) //显示最后一张卡片
      card.last(jpanel);
  }
  public static void main(String args[]) {
    testCardLayout obj = new testCardLayout();
  }
}