Thread 交替打印1-10_使用thread类,ab线程打印1-10-优快云博客

本文深入探讨Java中三种线程同步方法：synchronized关键字、内置锁与可重入锁结合队列。通过具体示例代码，展示了如何使用这些方法实现线程间的正确同步，避免竞态条件，确保数据一致性。

创建打印Service
方法一
锁方法

public class Service {

    public synchronized void print(int num){
        try {
            this.notify();
            System.out.println(Thread.currentThread().getName()+ ": " + num);
            this.wait();
        }catch (InterruptedException e){
            e.printStackTrace();
        }
    }
}

方法二
锁this对象

public class Service {

    public void print(int num){
        try {
            synchronized (this) {
                this.notify();
                System.out.println(Thread.currentThread().getName() + ": " + num);
                this.wait();
            }
        }catch (InterruptedException e){
            e.printStackTrace();
        }
    }
}

方法三
可重入锁+队列

public class Service {

    private ReentrantLock reentrantLock = new ReentrantLock();
    private Condition condition = reentrantLock.newCondition();

    public void print(int num){
        try {
            reentrantLock.lock();
            condition.signal();//唤醒一个等待在condition上的线程，将该线程从等待队列中转移到同步队列中，如果在同步队列中能够竞争到Lock则可以从等待方法
            System.out.println(Thread.currentThread().getName() + ": " + num);
            condition.await();//得当前获取lock的线程进入到等待队列， 如果该线程能够从await()方法返回的话一定是该线程获取了与condition相关联的lock
        }catch (InterruptedException e){
            e.printStackTrace();
        } finally {
            reentrantLock.unlock();
        }
    }
}

线程A

public class ThreadA extends Thread {

    private Service service;

    public ThreadA(Service service) {
        this.service = service;
    }

    @Override
    public void run() {
        for (int i = 1; i <= 10; i += 2) {
            service.print(i);
        }
    }
}

线程B

public class ThreadB extends Thread {

    private Service service;

    public ThreadB(Service service) {
        this.service = service;
    }

    @Override
    public void run() {
        for (int i = 2; i <= 10; i += 2) {
            service.print(i);
        }
    }
}

测试

public class TestMain {

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