applet1.java

矩阵乘法的计算程序

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

import java.awt.event.*;
import java.util.Enumeration ;
public class Applet1 extends Applet implements ActionListener 
{
	private TextArea textArea;
	private String newline;
	public void init()
	{
	  Button b=new Button("Click to call getApplets()");
	  b.addActionListener(this);
	  setLayout(new BorderLayout());
	  add("North",b);
	  textArea=new TextArea(5,40);
	  textArea.setEditable(false);
	  add("Center",textArea);
	  newline=System.getProperty("line.separator");
		
	}

	public void actionPerformed(ActionEvent event){
		printApplets();
	}
	
	public String getAppletInfo(){
		return "GetApplets by Dong,li";
	}
	
	public void printApplets(){
		Enumeration e=getAppletContext().getApplets();
		
		textArea.append("Results of getApplets();"+newline);
		
		while(e.hasMoreElements()){
			Applet applet=(Applet)e.nextElement();
			String info=((Applet)applet).getAppletInfo();
			
			if(info!=null){
				textArea.append("-"+info+newline);
			}else{
				textArea.append("-"+applet.getClass().getName()+newline);
			}
		}
		textArea.append("_______________________"+newline+newline);
	}
}