Java(41)_卡片布局管理器

package MYSQK.example01;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

/**
 * 卡片布局管理器
 */
class Layout extends Frame implements ActionListener {
    CardLayout cardLayout = new CardLayout();//定义卡片布局管理器
    Panel cardPanel = new Panel();//定义面板放卡片
    Panel controlPanel = new Panel();//定义面板放置按钮
    Button preButton;//按钮声明
    Button nextButton;

    public  Layout(){
        this.setSize(300,200);//设置窗体大小
        cardPanel.setLayout(cardLayout);//设置布局为卡管理器 把cardPanel，而不是当前窗体！！！this
        cardPanel.add(new Label("FistCard",Label.CENTER));
        cardPanel.add(new Label("SecondCard",Label.CENTER));
        cardPanel.add(new Label("ThirdCard",Label.CENTER));

        nextButton = new Button("Next");
        preButton = new Button("Back");

        controlPanel.add(preButton);
        controlPanel.add(nextButton);

        this.add(cardPanel,BorderLayout.CENTER);
        this.add(controlPanel,BorderLayout.SOUTH);

        //为按钮添加事件监听器
        nextButton.addActionListener(this);
        preButton.addActionListener(this);

        this.addWindowListener(new WindowAdapter() {
            public void  windowClosing(WindowEvent e){
                Layout.this.dispose();
            }
        });

        this.setVisible(true);

    }
     @Override
    public  void actionPerformed(ActionEvent e){
        // 如果用户点击向后按钮
         if(e.getSource()==nextButton){
             cardLayout.next(cardPanel);
         }
         if(e.getSource()==preButton){
             cardLayout.previous(cardPanel);
         }
    }
}
public class example01 {
  public  static  void  main(String[] args){
       Layout layout = new Layout();
  }
}