转自：https://www.cnblogs.com/luozhijun/p/6895455.html
1. 要打印的资源
1 package com.mytest.thread;
2
3 /**
4 * 要打印的资源
5 *
6 */
7 public class Num {
8 int i = 1;
9 // 两个线程看， 交替执行的一个标志
10 boolean flag = false;
11 }
2. 打印奇数的线程
1 package com.mytest.thread;
2
3 public class PrintOdd implements Runnable {
4 Num num;
5
6 public PrintOdd(Num num) {
7 this.num = num;
8
9 }
10
11 public void run() {
12 while (num.i <= 100) {
13 synchronized (num) {
14 if (num.flag) {
15 try {
16 num.wait();
17 } catch (Exception e) {
18 System.out.println(e.getMessage());
19 }
20
21 } else {
22 System.out.println("奇数----" + num.i);
23 num.i++;
24 num.flag = true;
25 num.notify();
26 }
27
28 }
29 }
30 }
31 }
3. 打印偶数的线程
1 package com.mytest.thread;
2
3 public class PrintEven implements Runnable {
4
5 Num num;
6
7 public PrintEven(Num num) {
8 this.num = num;
9
10 }
11
12 public void run() {
13 while (num.i <= 100) {
14 synchronized (num) {// 必须要用同意吧锁对象，这个对象是num
15 if (!num.flag) {
16 try {
17 num.wait();// wait()函数必须和锁死同一个
18 } catch (Exception e) {
19 System.out.println(e.getMessage());
20 }
21
22 } else {
23 System.out.println("偶数----" + num.i);
24 num.i++;
25 num.flag = false;
26 num.notify();
27 }
28
29 }
30 }
31 }
32
33 }
4. 主函数
1 package com.mytest.thread;
2
3 public class Main {
4 public static void main(String[] args) {
5
6 Num num = new Num();
7
8 PrintOdd printOdd = new PrintOdd(num);
9 PrintEven printEven = new PrintEven(num);
10
11 Thread thread1 = new Thread(printOdd);
12 Thread thread2 = new Thread(printEven);
13
14 thread1.start();
15 thread2.start();
16 }
17 }
5. 运行结果
