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java如何模拟并发

2026-03-21 13:23:55Java

模拟并发的方法

在Java中模拟并发可以通过多种方式实现，以下是一些常见的方法：

使用`Thread`类创建多线程

通过继承Thread类或实现Runnable接口创建多个线程，模拟并发执行任务。

class MyThread extends Thread {
    public void run() {
        System.out.println("Thread running: " + Thread.currentThread().getName());
    }
}

public class Main {
    public static void main(String[] args) {
        for (int i = 0; i < 5; i++) {
            MyThread thread = new MyThread();
            thread.start();
        }
    }
}

使用`ExecutorService`线程池

通过线程池管理多个线程，更高效地模拟并发。

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class Main {
    public static void main(String[] args) {
        ExecutorService executor = Executors.newFixedThreadPool(5);
        for (int i = 0; i < 5; i++) {
            executor.execute(() -> {
                System.out.println("Thread running: " + Thread.currentThread().getName());
            });
        }
        executor.shutdown();
    }
}

使用`CountDownLatch`同步线程

通过CountDownLatch确保多个线程同时启动，模拟高并发场景。

import java.util.concurrent.CountDownLatch;

public class Main {
    public static void main(String[] args) throws InterruptedException {
        int threadCount = 5;
        CountDownLatch latch = new CountDownLatch(1);

        for (int i = 0; i < threadCount; i++) {
            new Thread(() -> {
                try {
                    latch.await();
                    System.out.println("Thread running: " + Thread.currentThread().getName());
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }).start();
        }

        Thread.sleep(1000); // 模拟准备时间
        latch.countDown(); // 同时释放所有线程
    }
}

使用`CompletableFuture`异步任务

通过CompletableFuture实现异步任务并发执行。

import java.util.concurrent.CompletableFuture;

public class Main {
    public static void main(String[] args) {
        for (int i = 0; i < 5; i++) {
            CompletableFuture.runAsync(() -> {
                System.out.println("Thread running: " + Thread.currentThread().getName());
            });
        }
        // 等待任务完成
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}