一道线程同步面试题

package com.wsy.model;/** * 完成主线程循环10次，接着子线程循环5次，如此往复10次 *  * @author wsy *  */public class TraditionalThreadCommunication {static Bussiness bussiness = new Bussiness();public static void main(String[] args) {new Thread(new Runnable() {@Overridepublic void run() {for (int i = 1; i <= 10; i++) {bussiness.sub(i);}}}).start();for (int i = 1; i <= 10; i++) {bussiness.main(i);}}}class Bussiness {static boolean isThreadSub = true;public synchronized void sub(int i) {while (!isThreadSub) {try {this.wait();} catch (InterruptedException e) {e.printStackTrace();}}for (int j = 1; j <= 10; j++) {System.out.println("sub: " + j + " of loop " + i);}isThreadSub = false;this.notify();}public synchronized void main(int i) {while (isThreadSub) {try {this.wait();} catch (InterruptedException e) {e.printStackTrace();}}for (int j = 1; j <= 5; j++) {System.out.println("main: " + j + " of loop " + i);}isThreadSub = true;this.notify();}}

输出结果：

sub: 1 of loop 1
sub: 2 of loop 1
sub: 3 of loop 1
sub: 4 of loop 1
sub: 5 of loop 1
sub: 6 of loop 1
sub: 7 of loop 1
sub: 8 of loop 1
sub: 9 of loop 1
sub: 10 of loop 1
main: 1 of loop 1
main: 2 of loop 1
main: 3 of loop 1
main: 4 of loop 1
main: 5 of loop 1
sub: 1 of loop 2
sub: 2 of loop 2
sub: 3 of loop 2
sub: 4 of loop 2
sub: 5 of loop 2
sub: 6 of loop 2
sub: 7 of loop 2
sub: 8 of loop 2
sub: 9 of loop 2
sub: 10 of loop 2
main: 1 of loop 2
main: 2 of loop 2
main: 3 of loop 2
main: 4 of loop 2
main: 5 of loop 2
sub: 1 of loop 3
sub: 2 of loop 3
sub: 3 of loop 3
sub: 4 of loop 3
sub: 5 of loop 3
sub: 6 of loop 3
sub: 7 of loop 3
sub: 8 of loop 3
sub: 9 of loop 3
sub: 10 of loop 3
main: 1 of loop 3
main: 2 of loop 3
main: 3 of loop 3
main: 4 of loop 3
main: 5 of loop 3
sub: 1 of loop 4
sub: 2 of loop 4
sub: 3 of loop 4
sub: 4 of loop 4
sub: 5 of loop 4
sub: 6 of loop 4
sub: 7 of loop 4
sub: 8 of loop 4
sub: 9 of loop 4
sub: 10 of loop 4
main: 1 of loop 4
main: 2 of loop 4
main: 3 of loop 4
main: 4 of loop 4
main: 5 of loop 4
sub: 1 of loop 5
sub: 2 of loop 5
sub: 3 of loop 5
sub: 4 of loop 5
sub: 5 of loop 5
sub: 6 of loop 5
sub: 7 of loop 5
sub: 8 of loop 5
sub: 9 of loop 5
sub: 10 of loop 5
main: 1 of loop 5
main: 2 of loop 5
main: 3 of loop 5
main: 4 of loop 5
main: 5 of loop 5
sub: 1 of loop 6
sub: 2 of loop 6
sub: 3 of loop 6
sub: 4 of loop 6
sub: 5 of loop 6
sub: 6 of loop 6
sub: 7 of loop 6
sub: 8 of loop 6
sub: 9 of loop 6
sub: 10 of loop 6
main: 1 of loop 6
main: 2 of loop 6
main: 3 of loop 6
main: 4 of loop 6
main: 5 of loop 6
sub: 1 of loop 7
sub: 2 of loop 7
sub: 3 of loop 7
sub: 4 of loop 7
sub: 5 of loop 7
sub: 6 of loop 7
sub: 7 of loop 7
sub: 8 of loop 7
sub: 9 of loop 7
sub: 10 of loop 7
main: 1 of loop 7
main: 2 of loop 7
main: 3 of loop 7
main: 4 of loop 7
main: 5 of loop 7
sub: 1 of loop 8
sub: 2 of loop 8
sub: 3 of loop 8
sub: 4 of loop 8
sub: 5 of loop 8
sub: 6 of loop 8
sub: 7 of loop 8
sub: 8 of loop 8
sub: 9 of loop 8
sub: 10 of loop 8
main: 1 of loop 8
main: 2 of loop 8
main: 3 of loop 8
main: 4 of loop 8
main: 5 of loop 8
sub: 1 of loop 9
sub: 2 of loop 9
sub: 3 of loop 9
sub: 4 of loop 9
sub: 5 of loop 9
sub: 6 of loop 9
sub: 7 of loop 9
sub: 8 of loop 9
sub: 9 of loop 9
sub: 10 of loop 9
main: 1 of loop 9
main: 2 of loop 9
main: 3 of loop 9
main: 4 of loop 9
main: 5 of loop 9
sub: 1 of loop 10
sub: 2 of loop 10
sub: 3 of loop 10
sub: 4 of loop 10
sub: 5 of loop 10
sub: 6 of loop 10
sub: 7 of loop 10
sub: 8 of loop 10
sub: 9 of loop 10
sub: 10 of loop 10
main: 1 of loop 10
main: 2 of loop 10
main: 3 of loop 10
main: 4 of loop 10
main: 5 of loop 10