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java之多線程搶火車票的實現(xiàn)示例

更新時間：2024年02月03日 09:32:24 作者：帥龍之龍

生活中有很多多線程的案例,購票就是一個很常見的問題,本文主要介紹了java之多線程搶火車票的實現(xiàn)示例,具有一定的參考價值,感興趣的可以了解一下

一、創(chuàng)建線程的方法是實現(xiàn)runnable，重寫run方法，執(zhí)行線程需要丟入runnable接口實現(xiàn)類,調(diào)用start方法

*********************************/
//多個線程同時操作一個類
    //火車票
public class TestTread4 implements Runnable{

    //票數(shù)
   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-- +"張票");
        }

    }

    public static void main(String[] args) {
        TestTread4 testTread4 = new TestTread4();

        new Thread(testTread4, "小明").start();
        new Thread(testTread4,"老師").start();
        new Thread(testTread4,"黃牛").start();
    }
}

發(fā)現(xiàn)問題:多個線程操作同一個資源的情況下,線程不安全，數(shù)據(jù)紊亂.

加上鎖就搞定

public class TestTread4 implements Runnable{

    //票數(shù)
   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-- +"張票");
        }

    }

    public static void main(String[] args) {
        TestTread4 testTread4 = new TestTread4();

        new Thread(testTread4, "小明").start();
        new Thread(testTread4,"老師").start();
        new Thread(testTread4,"黃牛").start();
    }
}

當(dāng)有200人搶100張票

public class TicketRunnable implements Runnable {

    /**
     * 總票數(shù)
     */
    private final int ticketSize = 100;

    /**
     * 搶票人數(shù)
     */
    private final int peopleSize = 200;

    /**
     * 票數(shù)
     */
    private int ticketNum;

    /**
     * 人數(shù)
     */
    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) + "個人搶到第" + (++ticketNum) + " 張票");
                    try {
                        Thread.sleep(100);
                    }catch (Exception e){
                        e.printStackTrace();
                    }
                    }else {
                        System.out.println(Thread.currentThread().getName() + "第" + (++peopleNum) + " 個人未搶到票");
                    }
                }
            }
        }

    }
}

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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