자바 레이아웃 관리의 CardLayout 간단 한 인 스 턴 스

import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;

public class TestCard implements ActionListener{
 
 private JFrame fm=new JFrame("     ");
 private JPanel cardpan,containbtn; //cardpan       ， containbtn       
 private JButton btn1,btn2,btn3,btn4; //         
 private JPanel pan1,pan2,pan3,pan4; //            
 private CardLayout card;    //      
 private JTextArea ta1,ta2,ta3,ta4; //         
 
 public TestCard(){
  
  //        
  cardpan=new JPanel();
  containbtn=new JPanel();
  card=new CardLayout();
  cardpan.setLayout(card);
  
  btn1=new JButton("  ");
  btn2=new JButton("  ");
  btn3=new JButton("   ");
  btn4=new JButton("   ");
  
  ta1=new JTextArea(30,30);
  ta2=new JTextArea(30,30);
  ta3=new JTextArea(30,30);
  ta4=new JTextArea(30,30);
  
  //                
  containbtn.add(btn1);
  containbtn.add(btn2);
  containbtn.add(btn3);
  containbtn.add(btn4);
  
  pan1=new JPanel();
  //         
  btn1.addActionListener(this);
  btn2.addActionListener(this);
  btn3.addActionListener(this);
  btn4.addActionListener(this);
  
  
  //                 
  ta1.append("       ，\r
");
  ta1.append("       。\r
");
  ta1.append("       ，\r
");
  ta1.append("       。");
  
  ta2.append("       ，\r
");
  ta2.append("       。\r
");
  ta2.append("       ，\r
");
  ta2.append("       。");
  
  ta3.append("       ，\r
");
  ta3.append("       。\r
");
  ta3.append("       ，\r
");
  ta3.append("       。");
  
  ta4.append("     ，\r
");
  ta4.append("     。\r
");
  ta4.append("     ，\r
");
  ta4.append("     。");
  
  pan1.add(ta1);
  pan2=new JPanel();
  pan2.add(ta2);
  pan3=new JPanel();
  pan3.add(ta3);
  pan4=new JPanel();
  pan4.add(ta4);
  
  //                 
  cardpan.add("b1",pan1);
  cardpan.add("b2",pan2);
  cardpan.add("b3",pan3);
  cardpan.add("b4",pan4);
  
  
  fm.add(containbtn,BorderLayout.NORTH);//              
  fm.add(cardpan,BorderLayout.CENTER);//               
  
  fm.setSize(400,400);
  fm.setLocation(200,100);
  fm.setVisible(true);
  fm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 }
 
 public static void main(String[] args) {
  new TestCard();
 }

public void actionPerformed(ActionEvent e) {
 // TODO Auto-generated method stub
 /**
  * e.getActionCommand（）                
  * card.show(cardpan, "b1");              
  * CardLayout.show(Container parent, String name)：           
  */
 if("  ".equals(e.getActionCommand())){
  card.show(cardpan, "b1");
 }
 if("  ".equals(e.getActionCommand())){
  card.show(cardpan, "b2");
 }
 if("   ".equals(e.getActionCommand())){
  card.show(cardpan, "b3");
 }
 if("   ".equals(e.getActionCommand())){
  card.show(cardpan, "b4");
 }
}
}