cardl.java

用java编写的一些初级代码

import java.awt.*;
import java.awt.event.*;
public class CardL
{
    CardLayout cl=new CardLayout();
    Panel plCenter=new Panel();
    public static void main(String []args)
    {
	new CardL().init();
    }
    public void init()
    {
	Frame f = new Frame("22");
	Panel plWest=new Panel();
	f.add(plWest,"West");
	f.add(plCenter);

	plWest.setLayout(new GridLayout(3,1));
	Button Prebtn=new Button("prev");
	plWest.add(Prebtn);
	Button Nexbtn=new Button("next");
	plWest.add(Nexbtn);
	Button Thrbtn=new Button("three");
	plWest.add(Thrbtn);

	plCenter.setLayout(cl);
	plCenter.add(new Button("One"),"1");
	plCenter.add(new Button("two"),"2");
	plCenter.add(new Button("three"),"3");
	plCenter.add(new Button("four"),"4");
	plCenter.add(new Button("five"),"5");

	class ActLis implements ActionListener
	{

	    public void actionPerformed(ActionEvent e)
	    {
		if(e.getActionCommand().equals("prev"))
		    cl.previous(plCenter);
		else if(e.getActionCommand().equals("next"))
		    cl.next(plCenter);
		else if(e.getActionCommand().equals("three"))
		    cl.show (plCenter,"3");
	    }
	}

	ActLis ma =new ActLis();
	Prebtn.addActionListener(ma);
	Nexbtn.addActionListener(ma);
	Thrbtn.addActionListener(ma);
	f.setSize(300,300);
	f.setVisible(true);
    }
}