package com.basic; /**

* @program JavaBooks

* @description: synchronized关键字

* @author: mf

* @create: 2019/12/26 21:00

*/

/**

* 对某个对象加锁

*/

public class T1 {

private int count = 10;

private static int count1 = 10;

private Object o = new Object();

public void m() {

synchronized (o) { // 给o对象加锁， o是监视器

count--;

System.out.println(Thread.currentThread().getName() + " count = " + count);

}

}

public void m1() {

synchronized (this) { // 任何线程要执行下面的代码，必须先拿到this的锁

count--;

System.out.println(Thread.currentThread().getName() + " count = " + count);

}

}

public synchronized void m2() { // 等效synchroniezd(this)

count--;

System.out.println(Thread.currentThread().getName() + " count = " + count);

}

public static synchronized void m3() { // class对象

count1--;

System.out.println(Thread.currentThread().getName() + " count = " + count1);

}

public static void m4() {

synchronized (T1.class) {

count1--;

}

}

}