public class TestSynchronized1 {        public static void main(String[] args) {        Fun1 fun = new Fun1();        Fun1 fun1 = new Fun1();        new Thread(new Runnable() {            @Override            public void run() {                String name = Thread.currentThread().getName();                fun.runSync(name);                System.out.println("thread end:" + name);            }        }, "thread-1").start();        new Thread(new Runnable() {            @Override            public void run() {                String name = Thread.currentThread().getName();                fun.runThis(name);                System.out.println("thread end:" + name);            }        }, "thread-2").start();        /*TestSynchronized1 sss = new TestSynchronized1();        Fun1 fun = new Fun1();        new Thread(sss.new Thread1(fun),"thread-1").start();        new Thread(sss.new Thread2(fun),"thread-2").start();*/    }    class Thread1 implements Runnable {        private Fun1 fun;        public Thread1(Fun1 fun) {            this.fun = fun;        }        @Override        public void run() {            String name = Thread.currentThread().getName();            try {                Thread.sleep(200);            } catch (InterruptedException e) {                e.printStackTrace();            }            fun.runThis(name);            System.out.println("thread end:" + name);        }    }    class Thread2 implements Runnable {        private Fun1 fun;        public Thread2(Fun1 fun) {            this.fun = fun;        }        @Override        public void run() {            String name = Thread.currentThread().getName();            try {                Thread.sleep(200);            } catch (InterruptedException e) {                e.printStackTrace();            }            fun.runThis(name);            System.out.println("thread end:" + name);        }    }}class Fun1 {/*//同实例 不阻塞。不同实例 不阻塞。不是同一个锁fun.runSync(name);fun.runThis(name);//同实例 阻塞。同实例 阻塞。同一个锁fun.runS(name);fun1.runThis(name); */    //都不阻塞    public void run(String name) {        try {            for (int i = 0; i < 5; i++) {                System.out.println("thread in:" + name);                Thread.sleep(200);                System.out.println("thread out:" + name);            }        } catch (InterruptedException e) {            e.printStackTrace();        }    }    //同实例 阻塞    //不同实例 不阻塞    public synchronized void runSync(String name) {        try {            for (int i = 0; i < 5; i++) {                System.out.println("thread in:" + name);                Thread.sleep(200);                System.out.println("thread out:" + name);            }        } catch (InterruptedException e) {            e.printStackTrace();        }    }    //同实例 阻塞    //不同实例 阻塞    public static synchronized void runS(String name) {        try {            for (int i = 0; i < 5; i++) {                System.out.println("thread in:" + name);                Thread.sleep(200);                System.out.println("thread out:" + name);            }        } catch (InterruptedException e) {            e.printStackTrace();        }    }    //同实例 阻塞    //不同实例 阻塞    public void runThis(String name) {        synchronized (Fun1.class) {            try {                for (int i = 0; i < 5; i++) {                    System.out.println("thread in:" + name);                    Thread.sleep(200);                    System.out.println("thread out:" + name);                }            } catch (InterruptedException e) {                e.printStackTrace();            }        }    }}