定时器连环炸弹：先2s炸一下，再4s炸一下，再2s炸一下，再4s炸一下如此循环下去。

定义两个炸弹：
public class SerialBomings {

    public static void main(String[] args) {

        new Timer().schedule(new MyTimerTask(), 2000);
        new Timer().schedule(new MyTimerTask2(), 6000);
        while(true){
            System.out.println(new Date().getSeconds());
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

class MyTimerTask extends TimerTask{
    @Override
    public void run() {
        System.out.println("bombing2");
        new Timer().schedule(new MyTimerTask2(), 6000);
    }
}
class MyTimerTask2 extends TimerTask{
    @Override
    public void run() {
        System.out.println("bombing");
        new Timer().schedule(new MyTimerTask(), 6000);

    }
}

定义一个炸弹
public class SerialBomings {

    public static void main(String[] args) {

        new Timer().schedule(new MyTimerTask(), 2000);
        //new Timer().schedule(new MyTimerTask2(), 6000);
        while(true){
            System.out.println(new Date().getSeconds());
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}
class MyTimerTask extends TimerTask{
    //静态变量
       static int count = 0;
    @Override
    public void run() {
        count = (count+1)%2;
        System.out.println("bombing");
        new Timer().schedule(new MyTimerTask(), 2000 + count*2000);

    }

}