JAVA多线程编程小实验

实验要求：
（1）掌握两种创建线程的方法；
（2）掌握线程同步的方法。
实验内容：
（1）编程模拟售票系统，模拟多个窗口（至少4个）同时出售100张车票的情况；用实现Runnable接口的方法实现多线程。

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class TicketSell {
    public static void main(String[] args) {
        Runnable windows = new Ticket();

        Thread t1 = new Thread(windows, "--窗口1--");
        Thread t2 = new Thread(windows, "--窗口2--");
        Thread t3 = new Thread(windows, "--窗口3--");
        Thread t4 = new Thread(windows, "--窗口4--");

        t1.start();
        t2.start();
        t3.start();
        t4.start();
    }
}


class Ticket implements Runnable{
    private final Lock lock = new ReentrantLock();  //线程同步
    private int ticketNumber = 100;
    @Override
    public void run() {
        while (ticketNumber > 0){
            lock.lock();
            try{
                if(ticketNumber <= 0)   break;
                ticketNumber--;
                System.out.println(Thread.currentThread().getName()+"出售车票，车票余量："+ticketNumber);
                Thread.sleep(110);  //出票需要时间
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            } finally {
                lock.unlock();
            }
        }
    }
}

（2）利用多线程机制编写程序，输出一个问候语，要求每隔1秒钟输出一个字符。用2种方法分别创建线程。
例如：问候语=“welcome!”，运行结果可能有多种情况，如下表所示，分别说明原因及创建线程的方法。

第一个：

public class Welcome1 {
    public static void main(String[] args) {
        Thread t1 = new WelcomeThread();
        Thread t2 = new WelcomeThread();
        t1.start();
        t2.start();
    }
}
class WelcomeThread extends Thread{
    String welcome = "welcome!";
    @Override
    public void run() {
        for (int i = 0; i < welcome.length(); i++) {
            System.out.println(Thread.currentThread().getName()+":"+welcome.charAt(i));
            try {
                Thread.sleep(1000); //每隔1s输出一个字符
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
        }
    }
}

第二个：

public class Welcome2 {
    public static void main(String[] args) {
        String welcome = "welcome!";
        Runnable r = () -> {
            for (int i = 0; i < welcome.length(); i++){
                System.out.println(Thread.currentThread().getName()+":"+welcome.charAt(i));
                try {
                    Thread.sleep(1000); //每隔1s输出一个字符
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
            }
        };
        Thread t = new Thread(r);
        t.start();
    }
}

第三个：

public class Welcome3 {
    public static void main(String[] args) {
        Runnable r = new WelcomeRunnable();
        Thread t1 = new Thread(r);
        Thread t2 = new Thread(r);
        t1.start();
        t2.start();
    }
}

class WelcomeRunnable implements Runnable{
    String welcome = "welcome!";
    int i = 0;
    @Override
    public void run() {
        while (i < welcome.length() - 1) {
            synchronized (this) {
                System.out.println(Thread.currentThread().getName() + ":" + welcome.charAt(i));
                i++;
                try {
                    Thread.sleep(1000); //每隔1s输出一个字符
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
            }
        }
    }
}

第四个：

public class Welcome4 {
    public static void main(String[] args) {
        Runnable r = new WelcomeRunnable1();
        Thread t1 = new Thread(r);
        Thread t2 = new Thread(r);
        t1.start();
        t2.start();
    }
}

class WelcomeRunnable1 implements Runnable{
    String welcome = "welcome!";
    int i = 0;
    @Override
    public void run() {
        while (i < welcome.length()) {
            System.out.println(Thread.currentThread().getName() + ":" + welcome.charAt(i));
            i++;
            try {
                Thread.sleep(1000); //每隔1s输出一个字符
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
        }
    }
}

在此页面也可查看：
https://blog.csdn.net/weixin_57780057/article/details/124518943?spm=1001.2014.3001.5501