线程同步的三种实现方式

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java线程的同步问题可以通过三种方式实现：

首先创建四个线程：

public class Test01 {public static void main(String[] args) {//创建接口实现类实例化对象Runnable r1 = new TicketRunnableImpl();//创建线程Thread t1 = new Thread(r1, "窗口一");Thread t2 = new Thread(r1, "窗口二");Thread t3 = new Thread(r1, "窗口三");Thread t4 = new Thread(r1, "窗口四");//启动线程t1.start();t2.start();t3.start();t4.start();}}

实现方式一：使用synchronized代码块

public class TicketRunnableImpl implements Runnable{private int ticketNum = 1000;@Overridepublic void run() {while (ticketNum > 0) {//同步代码块synchronized (this) {//判断if (ticketNum > 0) {ticketNum--;System.out.println(Thread.currentThread().getName() + "售出一张票，剩余：" + ticketNum);try {Thread.sleep(10);} catch (InterruptedException e) {e.printStackTrace();}}}}}}

实现方式二：使用对象锁

import java.util.concurrent.locks.Lock;import java.util.concurrent.locks.ReentrantLock;public class TicketRunnableImpl implements Runnable{private int ticketNum = 1000;//创建锁对象Lock lock = new ReentrantLock();@Overridepublic void run() {while (ticketNum > 0) {//上锁lock.lock();//判断if (ticketNum > 0) {ticketNum--;System.out.println(Thread.currentThread().getName() + "售出一张票，剩余：" + ticketNum);try {Thread.sleep(10);} catch (InterruptedException e) {e.printStackTrace();}}//解锁lock.unlock();}}}

实现方式三：使用同步方法

public class TicketRunnableImpl implements Runnable{private int ticketNum = 1000;@Overridepublic void run() {while (ticketNum > 0) {sellTickets();}}//同步方法public synchronized void sellTickets() {//判断if (ticketNum > 0) {ticketNum--;System.out.println(Thread.currentThread().getName() + "售出一张票，剩余：" + ticketNum);try {Thread.sleep(100);} catch (InterruptedException e) {e.printStackTrace();}}}}

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