java 使用线程定时执行任务的简单例子

[java]代码库

public class ThreadTest extends HttpServlet implements Runnable {

    public void run() {
        try {
            Calendar c;
            while(true){
                c=Calendar.getInstance();//时间对象
                int mm=30;//默认线程间隔时间
                System.out.println("mm:"+mm+"  time:"+c.get(Calendar.SECOND));
                //初始第一次的间隔时间
                if(c.get(Calendar.SECOND)%30!=0)
                {
                    System.out.println("第一次间隔时间设置");
                    mm=60-c.get(Calendar.SECOND);
                }
                System.out.println("mm:"+mm);
                Thread.sleep(mm*1000L);
                if(c.get(Calendar.SECOND)==0)//条件执行
                System.out.println("run Thread");

            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    public void init() throws ServletException {
        System.out.println("------------Thread init()-------------");
        ThreadTest t=new ThreadTest();
        new Thread(t).start();
    }
    public static void main(String[] args) {
        Calendar c=Calendar.getInstance();
        System.out.println(c.get(Calendar.SECOND));
        ThreadTest t=new ThreadTest();
        new Thread(t).start();
    }

}

//源代码片段来自云代码http://yuncode.net