What are the implementation methods of parallel programming in Java? How to choose?

Java parallel programming implementation methods: 1. Multi-threading, 2. Thread pool, 3. Lock, 4. Atomic variables. Choosing the appropriate method depends on the requirements, for example: High throughput: multi-threading or thread pool Low response time: threads Pool or atomic variable resources are limited: thread pool or lock

Java parallel programming implementation

Java provides a variety of Mechanisms to implement parallel programming, including:

• Multi-threading: Create and run multiple threads of simultaneous execution.
• Thread pool: Manage and reuse threads to improve performance.
• Lock: Used to coordinate access to shared resources and prevent conflicts.
• Atomic variables: Provides thread-safe variables for update operations.

How to choose the appropriate implementation method?

Choosing the appropriate parallel programming implementation depends on the needs of the application:

• High throughput: Multiple threads or thread pools.
• Low response time: Thread pool or atomic variables.
• Resource limited: Thread pool or lock.

Practical case:

Use thread pool to improve throughput:

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

public class ThreadPoolDemo {
    public static void main(String[] args) {
        // 创建一个固定大小的线程池
        ExecutorService executor = Executors.newFixedThreadPool(10);

        // 创建任务
        Runnable task = () -> {
            System.out.println("Hello from thread " + Thread.currentThread().getName());
        };

        // 提交任务到线程池
        for (int i = 0; i < 100; i++) {
            executor.submit(task);
        }

        // 等待所有任务完成
        executor.shutdown();
        while (!executor.isTerminated()) {
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

Use atomic variables Implement thread safety:

import java.util.concurrent.atomic.AtomicInteger;

public class AtomicVariableDemo {
    public static void main(String[] args) {
        // 创建一个原子整数
        AtomicInteger counter = new AtomicInteger(0);

        // 两个线程同时更新计数器
        Thread thread1 = new Thread(() -> {
            for (int i = 0; i < 100000; i++) {
                counter.incrementAndGet();
            }
        });
        Thread thread2 = new Thread(() -> {
            for (int i = 0; i < 100000; i++) {
                counter.incrementAndGet();
            }
        });

        thread1.start();
        thread2.start();

        // 等待线程完成
        try {
            thread1.join();
            thread2.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        // 打印最终计数器值
        System.out.println("Final count: " + counter.get());
    }
}

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