N个线程轮流打印数字问题

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//一个关于线程的经典面试题，要求用三个线程，按顺序打印1,2,3,4,5.... 71,72,73,74, 75.//线程1先打印1,2,3,4,5, 然后是线程2打印6,7,8,9,10, 然后是线程3打印11,12,13,14,15. //接着再由线程1打印16,17,18,19,20....以此类推, 直到线程3打印到75。public class Printer implements Runnable {int id;static int num = 1;public Printer(int id) {this.id = id;}@Overridepublic void run() {synchronized (Printer.class) {while (num <= 75) {if (num / 5 % 3 == id) {System.out.print("id" + id + ":");for (int i = 0; i < 5; i++)System.out.print(num++ + ",");System.out.println();Printer.class.notifyAll();} else {try {Printer.class.wait();} catch (InterruptedException e) {e.printStackTrace();}}}}}public static void main(String[] args) {new Thread(new Printer(0)).start();new Thread(new Printer(1)).start();new Thread(new Printer(2)).start();}}

打印结果：

id0:1,2,3,4,5,id1:6,7,8,9,10,id2:11,12,13,14,15,id0:16,17,18,19,20,id1:21,22,23,24,25,id2:26,27,28,29,30,id0:31,32,33,34,35,id1:36,37,38,39,40,id2:41,42,43,44,45,id0:46,47,48,49,50,id1:51,52,53,54,55,id2:56,57,58,59,60,id0:61,62,63,64,65,id1:66,67,68,69,70,id2:71,72,73,74,75,

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