用守护线程的方式实现定时任务

public class ThreadTest {
    public static int  sign= 0;

    public static void main(String[] args) {

        Thread thread = new Thread(
                        new Runnable(){
                            public void run(){
                                while(true){
                                    if(sign%10 !=0){ //这个条件可以设置为取时间判断
                                        System.out.println("守护线程保持运行");
                                        sign++;
                                    }else{
                                        System.out.println("调用定时任务");
                                        sign++;
                                    }
                                    try {
                                        Thread.sleep(5000);
                                    } catch (InterruptedException e) {
                                        e.printStackTrace();
                                    }
                                }
                            }
                        }
                        );

        thread.setDaemon(true); // 设置为守护线程，降低线程的优先级
        thread.start();

        while(true){
            System.out.println("主线程保持运行");  //守护线程必须保证有主线程存在，才会生存。 
            try {
                Thread.sleep(5000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

    }
}