cardlayouttest.java

java练习程序

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

class MyCanvasCardLayoutTest extends Canvas
{
	int x,y;
	MyCanvasCardLayoutTest (int a,int b)
	{
		x=a;
		y=b;
		getSize();
	}
	public void paint(Graphics g)
	{
		g.setColor(Color.red);
		g.fillOval(50,50,4*x,4*y);
		g.drawString("我第 "+x,20,90);
/*
		g.drawRect(3,3,40,40);
		g.drawOval(20,45,30,30);
		g.setColor(Color.yellow);
		g.fillRect(3,80,20,50);
*/
	}
	public Dimension getPreferredSize()
	{
		return new Dimension(200,100);
	}
}

public class CardLayoutTest extends Applet implements ActionListener
{
	CardLayout mycard;
	Button Btn1,Btn2,Btn3;
	MyCanvasCardLayoutTest  MyCanvas[];
	Panel p;
	public void init()
	{
		setLayout(new BorderLayout());
		mycard=new CardLayout();
		p=new Panel();
		p.setLayout(mycard);
		Btn1=new Button("first");
		Btn2=new Button("next");
		Btn3=new Button("last one");
		MyCanvas=new MyCanvasCardLayoutTest [21];
		for(int i=1;i<21;i++)
		{
			MyCanvas[i]=new MyCanvasCardLayoutTest(i,i);
			p.add(MyCanvas[i]);
		}
		Btn1.addActionListener(this);
		Btn2.addActionListener(this);
		Btn3.addActionListener(this);
		Panel p2=new Panel();
		p2.add(Btn1);p2.add(Btn2);p2.add(Btn3);
		add(p,"Center");
		add(p2,"South");
	}
	public void actionPerformed(ActionEvent e)
	{
		if(e.getSource()==Btn1)
		{
			mycard.first(p);
		}else if(e.getSource()==Btn2)
		{
			mycard.next(p);
		}else if(e.getSource()==Btn3)
		{
			mycard.last(p);
		}
	}
}