2.2.9同步静态方法和synchronized(class)效果一样

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package cha02.execise25;/** * Created by sunyifeng on 17/9/27. */public class Service {    public static void printA() {        synchronized (Service.class) { // FIXME: 注意这里            try {                System.out.println("进入方法printA，线程名称:" + Thread.currentThread().getName() + ",当前时间" + System.currentTimeMillis());                Thread.sleep(5000);                System.out.println("离开方法printA，线程名称:" + Thread.currentThread().getName() + ",当前时间" + System.currentTimeMillis());            } catch (InterruptedException e) {                e.printStackTrace();            }        }    }    public static void printB() {        synchronized (Service.class) {  // FIXME: 注意这里            System.out.println("进入方法printB，线程名称:" + Thread.currentThread().getName() + ",当前时间" + System.currentTimeMillis());            System.out.println("离开方法printB，线程名称:" + Thread.currentThread().getName() + ",当前时间" + System.currentTimeMillis());        }    }}

package cha02.execise25;/** * Created by sunyifeng on 17/9/27. */public class ThreadA extends Thread {    private Service service;    public ThreadA(Service service) {        super();        this.service = service;    }    @Override    public void run(){        service.printA(); //    }}

package cha02.execise25;/** * Created by sunyifeng on 17/9/27. */public class ThreadB extends Thread {    private Service service;    public ThreadB(Service service) {        super();        this.service = service;    }    @Override    public void run() {        service.printB();//    }}

package cha02.execise25;/** * Created by sunyifeng on 17/9/27. */public class Run {    public static void main(String[] args) {        Service service1 = new Service();        Service service2 = new Service();        //        ThreadA threadA = new ThreadA(service1);        threadA.setName("A");        threadA.start();        //        ThreadB threadB = new ThreadB(service2);        threadB.setName("B");        threadB.start();    }}

运行结果：

进入方法printA，线程名称:A,当前时间1507738817656
离开方法printA，线程名称:A,当前时间1507738822660
进入方法printB，线程名称:B,当前时间1507738822660
离开方法printB，线程名称:B,当前时间1507738822660

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