mytask4.java

java手机程序设计入门配套的源代码 很详细 感觉很好

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import java.util.*;

public class MyTask4 extends TimerTask
{
	long lasttime ;
    	public void run()
    	{
    		long now = System.currentTimeMillis();
    		System.out.print("Task4 Fire Time: ") ;
    	    	System.out.print(now);
    	    	System.out.print(" ; Intervel :") ;
    	    	System.out.println(now-lasttime);
    	    	lasttime = now ;
    	    	doSomething() ;
    	}
    	public void doSomething()
    	{	
    		//用随机数来模拟工作所需的时间，有时超过4000毫秒，有时少于4000毫秒
    		try
    		{
    			Random rdm = new Random() ;
    			int i = rdm.nextInt()%2 ;
    			if(i==0)
    			{
    				Thread.sleep(2500) ;
    				System.out.println("doSomething : 2500 millisecond");
    			}else
    			{
    				Thread.sleep(5500) ;
    				System.out.println("doSomething : 5500 millisecond");
    			}
    		}catch(Exception e){}
    		
    		
	}
}