cardlayoutframe.java

Eclipse程序设计经典教程+源代码 学习java的朋友可以看看

package layout;

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

public class CardLayoutFrame extends JFrame {
  JPanel contentPane;
  //创建CardLayout布局
  CardLayout cardLayout1 = new CardLayout();
  //创建3个面板
  JPanel jPanel1 = new JPanel();
  JPanel jPanel2 = new JPanel();
  JPanel jPanel3 = new JPanel();
  //创建3个标签
  JLabel jLabel1 = new JLabel();
  JLabel jLabel2 = new JLabel();
  JLabel jLabel3 = new JLabel();

  public CardLayoutFrame() {
    try {
      setDefaultCloseOperation(EXIT_ON_CLOSE);
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }

  public static void main(String[] args) {
    CardLayoutFrame frame = new CardLayoutFrame();
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    Dimension frameSize = frame.getSize();
    frame.setLocation((screenSize.width - frameSize.width) / 2,
        (screenSize.height - frameSize.height) / 2);
    frame.setVisible(true);
  }
  
  private void jbInit() throws Exception  {
    contentPane = (JPanel) this.getContentPane();
    contentPane.setLayout(cardLayout1);
    this.setSize(new Dimension(400, 300));
    this.setTitle("CardLayout示例");
    //设置标签的字体
    jLabel1.setFont(new java.awt.Font("Dialog", 1, 16));
    jLabel2.setFont(new java.awt.Font("Dialog", 1, 16));
    jLabel3.setFont(new java.awt.Font("Dialog", 1, 16));
    //设置标签的字符串
    jLabel1.setText("第1页");
    jLabel2.setText("第2页");
    jLabel3.setText("第3页");
    //为面板加入标签
    jPanel1.add(jLabel1, null);
    jPanel2.add(jLabel2, null);
    jPanel3.add(jLabel3, null);
    //为窗口面板加入面板,每一个面板就是一页，第2个参数定义面板的名字
    contentPane.add(jPanel1, "jPanel1");
    contentPane.add(jPanel2,  "jPanel2");
    contentPane.add(jPanel3,  "jPanel3");
    //根据名字显示第2个页面
    cardLayout1.show(contentPane, "jPanel2");
  }
}