eclipse中创建maven项目

代码如下

package chapterTwo.synchronize;

import chapterTwo.synchronizeUtils.Service;
import chapterTwo.synchronizeUtils.*;

public class Run {
    public static void main(String[] args){
        Service service = new Service();
        ThreadA threadA = new ThreadA(service);
        threadA.setName("A");
        threadA.start();
        ThreadB ThreadB = new ThreadB(service);
        ThreadB.setName("B");
        ThreadB.start();
        ThreadC ThreadC = new ThreadC(service);
        ThreadC.setName("C");
        ThreadC.start();

    }
}

----------

package chapterTwo.synchronizeUtils;

public class ThreadA extends Thread {
    private Service service;
    public ThreadA(Service service) {
        super();
        this.service = service;
    }

    @Override
    public void run(){
        super.run();
        service.printA();
    }
}
-----------
package chapterTwo.synchronizeUtils;

public class ThreadB extends Thread {
    private Service service;
    public ThreadB(Service service) {
        super();
        this.service = service;
    }

    @Override
    public void run(){
        super.run();
        service.printB();
    }
}

----------
package chapterTwo.synchronizeUtils;

public class ThreadC extends Thread {
    private Service service;
    public ThreadC(Service service) {
        super();
        this.service = service;
    }

    @Override
    public void run(){
        super.run();
        service.printC();
    }
}
------------
package chapterTwo.synchronizeUtils;

public class Service {
    //Service类锁
    synchronized public static void printA(){
        try {
            System.out.println("线程：" + Thread.currentThread().getName() + ",进入printA方法。");
            Thread.sleep(3000);
            System.out.println("线程：" + Thread.currentThread().getName() + ",离开printA方法。");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
    //Service类锁 ，同一个类的类锁方法与类锁方法同步
    synchronized public static void printB(){
        try {
            System.out.println("线程：" + Thread.currentThread().getName() + ",进入printB方法。");
            Thread.sleep(3000);
            System.out.println("线程：" + Thread.currentThread().getName() + ",离开printB方法。");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
    //对象锁，与类锁不同步，即这个类的对象调用这个类的类锁方法与对象锁方法不同步
    synchronized public void printC(){ 
        try {
            System.out.println("线程：" + Thread.currentThread().getName() + ",进入printC方法。");
            Thread.sleep(3000);
            System.out.println("线程：" + Thread.currentThread().getName() + ",离开printC方法。");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }


}

结果：

总结：

• 同一个类的类锁方法及代码块是同步的。
• 同一个类的对象锁和类锁方法及代码块是不同步的。