CardLayout的问题:

Question

CardLayout 是实现了card 的效果; 你如果要有效果, JPanel 中加事件, 用CardLayout 中的 next(Container parent) 方法 
for example 
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class CardTest extends JFrame 
{
 JPanel c1; 
 CardLayout cardpanel;
    public CardTest()
    {
         c1=new JPanel();
       cardpanel =new CardLayout();
         c1.setLayout(cardpanel);
         JButton b1=new JButton("a");
         JButton b2=new JButton("b");
         ActionListener action=new ActionListener(){
               public void actionPerformed(ActionEvent e)
               {
               
                cardpanel.next(c1);
             }   
         
          };
        
        b1.addActionListener(action);
        b2.addActionListener(action);
        
        c1.add(b1,"1");
        c1.add(b2,"2"); 
       getContentPane().add(c1);
       setSize(100,200);
       setVisible(true);  
    
    }
    public static void main (String args[])
    {
         new CardTest();
         
    
    }

}点击button 就可以display the next button

Answer 1

多谢楼上的代码,不过答非所问.我遇到的问题是在一个以CardLayout为布局管理器的JPanel上再放一个相同的JPanel,比如在你的c1上再放一个c2,
JPanel c2 = new JPanel();
CardLayout cardLayout2 = new CardLayout();
c2.setLayout( cardLayout2 );
c1.add(c2);
这时我遇到了问题,c2没有显示出一个CardLayout所应有的性质.

Answer 2

c1.add( c2 , "c2" );

Answer 3

用一个JPanel 就可以了,原理是一样地
 
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class CardTest extends JFrame 
{
 JPanel c1; 
 JPanel c2;
 JPanel c3;
 CardLayout cardpanel;
 CardLayout cardpanel1;
 CardLayout card;
 Container con;
static  int i=0;
    public CardTest()
    {
         c1=new JPanel();
         c2=new JPanel();
         c3=new JPanel();
           
         card=new CardLayout();
         cardpanel =new CardLayout();
         cardpanel1 =new CardLayout();
         
         c1.setLayout(cardpanel);
         c2.setLayout(cardpanel1); 
         c3.setLayout(card); 
         
         JButton b1=new JButton("a");
         JButton b2=new JButton("b");
         JButton b3=new JButton("c");
         JButton b4=new JButton("d");
        
         
         ActionListener action=new ActionListener(){
               public void actionPerformed(ActionEvent e)
               {
                     if (i<c1.getComponentCount())
                     {
                          cardpanel.next(c1); 
                          i++;
                     }
                     if (i==c1.getComponentCount())
                      {
                          card.next(c3) ;
                         i++;
                      }
                     if (i<=c2.getComponentCount()+3)
                         {
                            cardpanel1.next(c2);
                            i++ ;
                         
                         }
                     if(i>=c2.getComponentCount()+c1.getComponentCount()+1)
                        {
                         System.out.println(i);
                         i=0;
                         card.next(c3);
                        
                        
                        }     
                      
                      
               
         
          }
          };
        
        b1.addActionListener(action);
        b2.addActionListener(action);
        b3.addActionListener(action);
        b4.addActionListener(action);
        
        c1.add(b1,"1");
        c1.add(b2,"2");
        c2.add(b3,"3");
        c2.add(b4,"4"); 
        c3.add(c1,"c1");
        c3.add(c2,"c2");        
       
       con=getContentPane();
       con.add(c3);
       
       setSize(100,200);
       setVisible(true);  
    
    }
    public static void main (String args[])
    {
         new CardTest();
         
    
    }

}