myapplet.java

小程序不断地显示绿色的数字

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

import java.util.*;

public class Myapplet extends Applet implements Runnable{
	static Graphics pn;
		int num=1;
		int j=0,k=0;
		Thread thread1;
		boolean flag;

	public  void init()
		
	{
		setLayout(null);
		setBackground(Color.gray);
		
		setFont(new Font("Bookman Old style",Font.BOLD,20));
		pn=getGraphics();
		
	}
	
	public void start()
		{	
			thread1=new Thread(this);
			thread1.start();
		}
	public void run()
	{
		
		while(true)
		{	
			pn.setColor(Color.red);
			
			for(int i=2;i<num;i++)
				

			 if(num%i==0)
			pn.setColor(Color.green);
			//repaint();
			pn.drawString(Integer.toString(num),50+k,20+j*20);
				
				
				try{
				Thread.sleep(1000);
			} catch(InterruptedException e){}
			num++;
			j=j+1;
			if(j>19)
			{j=0;
			k=k+100;}
			
				
		}	
	}
}