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package com.ljf.mianshi.demo.mainshithread;public class TestJd {    public static void main(String args[]){        JDSB jdsb=new JDSB();        JDSB jdsb2=new JDSB();        new Thread(new ThreadA(jdsb),"A").start();        new Thread(new ThreadB(jdsb),"B").start();    }}package com.ljf.mianshi.demo.mainshithread;public class JDSB {    public static synchronized void   sayA() {        System.out.println("我是线程:"+Thread.currentThread().getName()+"我开始执行sayA");        try {            Thread.sleep(1000);        } catch (InterruptedException e) {            e.printStackTrace();        }        System.out.println("我是线程:"+Thread.currentThread().getName()+"我离开sayA");    }    public   synchronized  void sayB(){        System.out.println("我是线程:"+Thread.currentThread().getName()+"我开始执行sayB");        try {            Thread.sleep(1000);        } catch (InterruptedException e) {            e.printStackTrace();        }        System.out.println("我是线程:"+Thread.currentThread().getName()+"我离开sayB");    }}package com.ljf.mianshi.demo.mainshithread;public class ThreadA implements Runnable {    JDSB jdsb=null;    public ThreadA(JDSB jdsb) {        this.jdsb=jdsb;    }    @Override    public void run() {        jdsb.sayA();    }}package com.ljf.mianshi.demo.mainshithread;public class ThreadB implements Runnable {    JDSB jdsb=null;    public ThreadB(JDSB jdsb) {        this.jdsb=jdsb;    }    @Override    public void run() {        jdsb.sayB();    }}

结果：

我是线程:A我开始执行sayA

结论：

异步原因是持有不同的锁，一个是对象锁，另外一个是Class锁，Class锁可以对所有持有class锁的对象实例起作用

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