Java使用synchronized，实现互斥锁

代码

package per.thread;

import java.io.IOException;

public class Test {
    
    private int i = 0;
    private Object object = new Object();
     
    public static void main(String[] args) throws IOException  {
        
    	Test test = new Test();
        
        Test.MyThread thread1 = test.new MyThread();
        Test.MyThread thread2 = test.new MyThread();
        thread1.start();
        thread2.start();
    } 
     
     
    class MyThread extends Thread{
        @Override
        public void run() {
            synchronized (object) {
                i++;
                System.out.println("i:"+i);
                try {
                    System.out.println("线程"+Thread.currentThread().getName()+"进入睡眠状态");
                    Thread.currentThread().sleep(10000);
                } catch (InterruptedException e) {
                    // TODO: handle exception
                }
                System.out.println("线程"+Thread.currentThread().getName()+"睡眠结束");
                i++;
                System.out.println("i:"+i);
            }
        }
    }
}

 

 

 

实现

i:1
线程Thread-0进入睡眠状态
线程Thread-0睡眠结束
i:2
i:3
线程Thread-1进入睡眠状态
线程Thread-1睡眠结束
i:4

分析

在thread1休眠之后，thread2没有立即执行，因为给object加了synchronized。