面试：双线程交替打印奇偶数

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代码如下：

package practice1;/*** 0-100的奇数偶数打印* 1、通过对象的wait和notify进行线程阻塞* 2、通过对num%2的结果进行奇数偶数的判断输出**/
public class JiOuOne {private static volatile int num = 0;private static final int max = 100;public static void main(String[] args) {String monitor = "monitor";// 偶数线程Thread oddThread = new Thread(new OddNumber(monitor));oddThread.setName("偶数打印：");// 奇数线程Thread evenThread = new Thread(new EvenNumber(monitor));evenThread.setName("奇数打印：");oddThread.start();evenThread.start();}/*** 打印偶数*/static class OddNumber implements Runnable {private String monitor;public OddNumber(String monitor) {this.monitor = monitor;}@Overridepublic void run() {while (num <= max) {synchronized (monitor) {// 如果num%2有余数，则除不尽，则阻塞while (num % 2 != 0) {try {monitor.wait();} catch (InterruptedException e) {e.printStackTrace();}}System.out.println(Thread.currentThread().getName() + "->" + num);num++;// 唤醒监视器monitor.notify();}}}}/*** 打印奇数*/static class EvenNumber implements Runnable {private String monitor;public EvenNumber(String monitor) {this.monitor = monitor;}@Overridepublic void run() {while (num < max) {synchronized (monitor) {// 如果num%2余数为0，则可以除尽，阻塞while (num % 2 == 0) {try {monitor.wait();} catch (InterruptedException e) {e.printStackTrace();}}System.out.println(Thread.currentThread().getName() + "->" + num);num++;// 唤醒对象监视器monitor.notify();}}}}}

运行结果：

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