java之多线程抢火车票的实现示例
作者：帅龍之龍
生活中有很多多线程的案例,购票就是一个很常见的问题,本文主要介绍了java之多线程抢火车票的实现示例,具有一定的参考价值,感兴趣的可以了解一下
一、创建线程的方法是实现runnable，重写run方法，执行线程需要丢入runnable接口实现类,调用start方法
*********************************/
//多个线程同时操作一个类
//火车票
public class TestTread4 implements Runnable{
//票数
private int ticketNums = 10;
@Override
public void run() {
while (true) {
if (ticketNums <= 0) {
break;
}
try {
Thread.sleep(200);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName()+"--->拿到了第"+ticketNums-- +"张票");
}
}
public static void main(String[] args) {
TestTread4 testTread4 = new TestTread4();
new Thread(testTread4, "小明").start();
new Thread(testTread4,"老师").start();
new Thread(testTread4,"黄牛").start();
}
}
发现问题:多个线程操作同一个资源的情况下,线程不安全，数据紊乱.
加上锁就搞定
public class TestTread4 implements Runnable{
//票数
private int ticketNums = 10;
@Override
public synchronized void run() {
while (true) {
if (ticketNums <= 0) {
break;
}
try {
Thread.sleep(200);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName()+"--->拿到了第"+ticketNums-- +"张票");
}
}
public static void main(String[] args) {
TestTread4 testTread4 = new TestTread4();
new Thread(testTread4, "小明").start();
new Thread(testTread4,"老师").start();
new Thread(testTread4,"黄牛").start();
}
}
当有200人抢100张票
public class TicketRunnable implements Runnable {
/**
* 总票数
*/
private final int ticketSize = 100;
/**
* 抢票人数
*/
private final int peopleSize = 200;
/**
* 票数
*/
private int ticketNum;
/**
* 人数
*/
private int peopleNum;
@Override
public void run() {
while(ticketNum < ticketSize && peopleNum < peopleSize){
synchronized (this){
if(ticketNum < ticketSize && peopleNum < peopleSize){
if((int)(Math.random() * 20) % 2 == 1){
System.out.println(Thread.currentThread().getName() + "第" + (++peopleNum) + "个人抢到第" + (++ticketNum) + " 张票");
try {
Thread.sleep(100);
}catch (Exception e){
e.printStackTrace();
}
}else {
System.out.println(Thread.currentThread().getName() + "第" + (++peopleNum) + " 个人未抢到票");
}
}
}
}
}
}
public class TestTicket {
public static void main(String[] args) {
TicketRunnable tr = new TicketRunnable();
Thread t1 = new Thread(tr , "窗口A");
Thread t2 = new Thread(tr , "窗口B");
Thread t3 = new Thread(tr , "窗口C");
Thread t4 = new Thread(tr , "窗口D");
t1.start();
t2.start();
t3.start();
t4.start();
}
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