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package com.lyss.java.concurrent;

/**

* 多个线程多个锁

* 多个线程 每个线程都能拿到自己指定的锁，分别获得锁之后，

* 执行synchronized方法体内的内容

*/

public class MultiThread {

private static int num = 0;

//static synchronized 加上该修饰符之后，锁变成类级别锁

//意思是只有一把锁

//无论有多少对象都可以同步

private synchronized void printNum(String tag) {

try {

if (tag.equals("a")) {

num = 100;

System.out.println("Tag A,值设置完毕。。。");

Thread.sleep(1000);

}else {

num = 200;

System.out.println("Tag B,值设置完毕。。。");

}

System.out.println("Tag:"+tag+"----"+"num:+"+num);

} catch (Exception e) {

e.printStackTrace();

}

}

public static void main(String[] args) {

//创建两个不同的对象

//一个对象有一把锁(对象锁)

final MultiThread myThread1 = new MultiThread();

final MultiThread myThread2 = new MultiThread();

Thread thread1 = new Thread(new Runnable() {

public void run() {

myThread1.printNum("a");

}

});

Thread thread2 = new Thread(new Runnable() {

public void run() {

myThread2.printNum("b");

}

});

thread1.start();

thread2.start();

}

}