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使用ReentrantLock和ThreadPoolExecutor模拟抢课

news 2025/7/18 22:16:30

这里主要是在场景下帮助理解ReentrantLock和线程池的使用。

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;public class GrabCourseTask implements Runnable {private final String studentName;private static int availableSeats = 10; // 假设有10个名额private static final Lock lock = new ReentrantLock(); // 创建一个ReentrantLock实例public GrabCourseTask(String studentName) {this.studentName = studentName;}@Overridepublic void run() {try {if(grabCourse()) {System.out.println(studentName + " 抢到了一个名额！");} else {System.out.println(studentName + " 没有抢到名额。");}} catch (InterruptedException e) {Thread.currentThread().interrupt();System.out.println(studentName + " 在尝试抢课时被中断。");}}private boolean grabCourse() throws InterruptedException {// 尝试获取锁if(lock.tryLock()) {try {if (availableSeats > 0) {availableSeats--; // 减少一个名额// 模拟服务器处理抢课请求需要一定的时间Thread.sleep(100);return true;}return false;} finally {lock.unlock(); // 确保在操作完成后释放锁}} else {// 如果无法立即获取锁，则表示当前有其他线程正在操作名额，直接返回失败return false;}}
}

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;public class CourseGrabbingSimulation {public static void main(String[] args) {// 创建线程池ThreadPoolExecutor executor = new ThreadPoolExecutor(5, // 核心线程数10, // 最大线程数1, // 空闲线程存活时间TimeUnit.SECONDS, // 时间单位new ArrayBlockingQueue<>(5)); // 任务队列// 模拟多个学生抢课for (int i = 1; i <= 15; i++) {String studentName = "学生" + i;executor.execute(new GrabCourseTask(studentName));}// 关闭线程池executor.shutdown();}
}