package test;
import java.io.*;
public class TicketThreadTest {
    public static void main(String[] args) throws IOException, InterruptedException {
        TicketThread ticket1 = new TicketThread();
        Thread thread1 = new Thread(ticket1, "窗口1");
        Thread thread2 = new Thread(ticket1, "窗口2");
        Thread thread3 = new Thread(ticket1, "窗口3");
        thread1.start();
        thread2.start();
        thread3.start();
        thread1.join(); // 等待三個(gè)線程結(jié)束后打印賣(mài)出總數(shù)
        thread2.join();
        thread3.join();
        System.out.println("sellNum: " + TicketThread.sellNum);
    }
}
class TicketThread implements Runnable {
    private static int ticketNum = 20; // 總票數(shù)
    public static int sellNum = 0; // 統(tǒng)計(jì)賣(mài)出總票數(shù)
    @Override
    public void run() {
        while (true) {
            if (ticketNum > 0) {
                System.out.println(Thread.currentThread().getName() + "賣(mài)出了一張票，剩余：" + --ticketNum);  // 賣(mài)出一張票
                sellNum++;  // 賣(mài)出總票數(shù)加1
            } else {
                break;
            }
            try {
                Thread.sleep(10);  // 每次sleep 10ms，提高出錯(cuò)可能
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
        }
    }
}

package test;
import java.io.*;
public class TicketThreadTest {
    public static void main(String[] args) throws IOException, InterruptedException {
        TicketThread ticket1 = new TicketThread();
        Thread thread1 = new Thread(ticket1, "窗口1");
        Thread thread2 = new Thread(ticket1, "窗口2");
        Thread thread3 = new Thread(ticket1, "窗口3");
        thread1.start();
        thread2.start();
        thread3.start();
        thread1.join(); // 等待三個(gè)線程結(jié)束后打印賣(mài)出總數(shù)
        thread2.join();
        thread3.join();
        System.out.println("sellNum: " + TicketThread.sellNum);
    }
}
class TicketThread implements Runnable {
    private static int ticketNum = 20; // 總票數(shù)
    public static int sellNum = 0; // 統(tǒng)計(jì)賣(mài)出總票數(shù)
    @Override
    public void run() {
        while (true) {
            synchronized (this) {	// 鎖住對(duì)共享變量的訪問(wèn)
                if (ticketNum > 0) {
                    System.out.println(Thread.currentThread().getName() + "賣(mài)出了一張票，剩余：" + --ticketNum);  // 賣(mài)出一張票
                    sellNum++;  // 賣(mài)出總票數(shù)加1
                } else {
                    break;
                }
            }
            try {
                Thread.sleep(10);  // 每次sleep 10ms，提高出錯(cuò)可能
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
        }
    }
}

//使用不同實(shí)例對(duì)象，main方法中修改如下:
TicketThread ticket1 = new TicketThread();
TicketThread ticket2 = new TicketThread();
TicketThread ticket3 = new TicketThread();
Thread thread1 = new Thread(ticket1, “窗口1”);
Thread thread2 = new Thread(ticket2, “窗口2”);
Thread thread3 = new Thread(ticket3, “窗口3”);
//TicketThread類(lèi)中修改為
synchronized(this.getClass())或synchronized(TicketThread.class)

package test;
import java.io.*;
public class TicketThreadTest {
    public static void main(String[] args) throws IOException, InterruptedException {
        TicketThread ticket1 = new TicketThread();
        Thread thread1 = new Thread(ticket1, "窗口1");
        Thread thread2 = new Thread(ticket1, "窗口2");
        Thread thread3 = new Thread(ticket1, "窗口3");
        thread1.start();
        thread2.start();
        thread3.start();
        thread1.join(); // 等待三個(gè)線程結(jié)束后打印賣(mài)出總數(shù)
        thread2.join();
        thread3.join();
        System.out.println("sellNum: " + TicketThread.sellNum);
    }
}
class TicketThread implements Runnable {
    private static int ticketNum = 20; // 總票數(shù)
    public static int sellNum = 0; // 統(tǒng)計(jì)賣(mài)出總票數(shù)
    @Override
    public void run() {
        while (true) {
            if(!sellOneTicket()){
                break;
            }
            try {
                Thread.sleep(10);  // 每次sleep 10ms，提高出錯(cuò)可能
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
        }
    }
    private synchronized boolean sellOneTicket(){
        if (ticketNum > 0) {
            System.out.println(Thread.currentThread().getName() + "賣(mài)出了一張票，剩余：" + --ticketNum);  // 賣(mài)出一張票
            sellNum++;  // 賣(mài)出總票數(shù)加1
            return true;
        } else {
            return false;
        }
    }
}