2.2.9同步静态方法与synchronized(class)

package cha02.execise22;

/**
* Created by sunyifeng on 17/9/26.
*/
public class Service {
// 打印方法A
synchronized public static void printA(){
try {
System.out.println("进入方法printA,线程名称：" + Thread.currentThread().getName());
Thread.sleep(3000);
System.out.println("离开方法printA,线程名称：" + Thread.currentThread().getName());
} catch (InterruptedException e) {
e.printStackTrace();
}
}

// 打印方法B
synchronized  public static void  printB(){
System.out.println("进入方法printB,线程名称：" + Thread.currentThread().getName());
System.out.println("离开方法printB,线程名称：" + Thread.currentThread().getName());
}
}

package cha02.execise22;

/**
* Created by sunyifeng on 17/9/26.
*/
public class ThreadA extends Thread {
@Override
public void run() {
//
Service.printA();
}
}

package cha02.execise22;

/**
* Created by sunyifeng on 17/9/26.
*/
public class ThreadB extends Thread {
@Override
public void run() {
//
Service.printB();
}
}

package cha02.execise22;

/**
* Created by sunyifeng on 17/9/26.
*/
public class Run {
public static void main(String[] args) {
//
ThreadA threadA = new ThreadA();
threadA.setName("A");
threadA.start();
//
ThreadB threadB = new ThreadB();
threadB.setName("B");
threadB.start();
}
}