CardLayout布局??

[hailun]

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
class Mycanvas extends Canvas
{
int x,y;
Mycanvas(int a,int b)
{
x=a;
y=b;
setSize(100,160);
}
public void paint(Graphics g)
{
g.setColor(Color.red);
g.fillOval(50,50,4*x,4*y);
g.drawString("我是第"+x,10,150);
}
}
public class Example12_3 extends Applet implements ActionListener
{
CardLayout mycard;
Button button1,button2,button3;
Mycanvas mycanvas[];
Panel p;
public void init()
{
setLayout(new BorderLayout());
mycard=new CardLayout();
p=new Panel();
p.setLayout(mycard);
button1=new Button("first");
button2=new Button("nex");
button3=new Button("last one");
mycanvas=new Mycanvas[21];
for(int i=1;i<=20;i++)
{
mycanvas[i]=new Mycanvas(i,i); //啥意思咋用的呀
p.add("i am"+i,mycanvas[i]); //啥意思咋用的呀
}
button1.addActionListener(this);
button2.addActionListener(this);
button3.addActionListener(this);
Panel p2=new Panel();
p2.add(button1);
p2.add(button2);
p2.add(button3);
add(p,BorderLayout.CENTER);add(p2,BorderLayout.SOUTH);
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==button1)
{
mycard.first(p);
}
else if(e.getSource()==button2)
{
mycard.next(p);
}
else if(e.getSource()==button3)
{
mycard.last(p);
}
}
}

[zhuyan911]

mycanvas[i]=new Mycanvas(i,i);调用Mycanvas里的Mycanvas
p.add("i am"+i,mycanvas[i]); 创建一个面板