【JAVA】wait和notify用法，附生产/消费模型

1 public abstract class Person implements Runnable{
2 
3     public static Object lock = new Object();
4     public static int ticket = 0;
5 
6     public abstract void execute();
7 }

 1 public class Producer extends Person {
 2     @Override
 3     public void execute() {
 4         synchronized (lock) {
 5             while (true){
 6                 if (ticket == 0) {
 7                     while(ticket<10) {
 8                         System.out.println("生产中，当前数量:"+ticket);
 9                         ticket++;
10                         try {
11                             Thread.sleep(1000);
12                         } catch (InterruptedException e) {
13                             e.printStackTrace();
14                         }
15                     }
16                     System.out.println("生产完毕，当前数量:"+ticket);
17                     lock.notify();
18                 }else{
19                     try {
20                         lock.wait();
21                     } catch (InterruptedException e) {
22                         e.printStackTrace();
23                     }
24                 }
25             }
26         }
27     }
28 
29     @Override
30     public void run() {
31         execute();
32     }
33 }

 1 public class Consumer extends Person {
 2     @Override
 3     public void execute() {
 4         synchronized (lock){
 5             while (true){
 6                 if(ticket==0){
 7                     try {
 8                         lock.wait();
 9                     } catch (InterruptedException e) {
10                         e.printStackTrace();
11                     }
12                 }else{
13                     System.out.println("消耗中，总数量:"+ticket);
14                     while (ticket>0){
15                         System.out.println("消耗中，当前数量:"+ticket);
16                         ticket--;
17                         try {
18                             Thread.sleep(1000);
19                         } catch (InterruptedException e) {
20                             e.printStackTrace();
21                         }
22                     }
23                     System.out.println("消耗完成，当前数量:"+ticket);
24                     lock.notify();
25                 }
26             }
27         }
28     }
29 
30     @Override
31     public void run() {
32         execute();
33     }
34 }

 1 public class Demo {
 2 
 3     public static void main(String[] args){
 4 
 5         //设置先生产还是先消费，默认ticket是0先生产。
 6         //ticket是静态的，所以可以这么设置，虽然不是很规范。
 7         new Producer().ticket = 6;
 8 
 9         Thread pro = new Thread(new Producer());
10         Thread con = new Thread(new Consumer());
11         pro.start();
12         con.start();
13     }
14 }