package JavaBasic;/**

* @Classname Synch

* @Description 对于同步的理解

* @Date 19-5-25 下午1:57

* @Created by mao<tianmao818@qq.com>

*/

class Callme{

// synchronized void call(String msg){

void call(String msg){

System.out.print("["+msg);

try{

Thread.sleep(1000);

}catch (InterruptedException e){

System.out.println("Interrupted");

}

System.out.println("]");

}

//假设这是第二方的代码,不能使用synchronized关键字修饰

}

class Caller implements Runnable{

String msg;

Callme target;

Thread t;

public Caller(Callme tar,String s){

target=tar;

msg=s;

t=new Thread(this);

t.start();

}

public void run(){

target.call(msg);

}

}

class Caller_2 implements Runnable{

String msg;

Callme target;

Thread t;

public Caller_2(Callme tar,String s){

target=tar;

msg=s;

t=new Thread(this);

t.start();

}

public void run(){

synchronized (target){

target.call(msg);

}

}

}

public class Synch {

public static void main(String[] args){

Callme target=new Callme();

//没有组织三个线程同时调用同一个对象的同一个方法,在call前面加上synchronized关键字

Caller ob1=new Caller(target,"hello");

Caller ob2=new Caller(target,"synchronized");

Caller ob3=new Caller(target,"world");

try {

ob1.t.join();

ob2.t.join();

ob3.t.join();

}catch (InterruptedException e){

System.out.println("interrupted");

}

Caller_2 ob11=new Caller_2(target,"hello");

Caller_2 ob22=new Caller_2(target,"synchronized");

Caller_2 ob33=new Caller_2(target,"world");

try {

ob11.t.join();

ob22.t.join();

ob33.t.join();

}catch (InterruptedException e){

System.out.println("interrupted");

}

}

}