Java Parallel Execution Guide

In Java, there are multiple ways to execute multiple methods concurrently. Here are some common methods:

1. Using threads: it is possible to create multiple threads and execute each method in a different thread. Threads can be created using the Thread class or by implementing the Runnable interface, and started using the start() method.

Thread thread1 = new Thread(new Runnable() {
    public void run() {
        // 执行方法1的代码
    }
});

Thread thread2 = new Thread(new Runnable() {
    public void run() {
        // 执行方法2的代码
    }
});

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

1. Using a thread pool: By using the thread pool in the java.util.concurrent package, you can parallelly execute multiple methods. Create a thread pool, then wrap each method into a Runnable object and submit it to the thread pool for execution.

ExecutorService executor = Executors.newFixedThreadPool(2);

executor.submit(new Runnable() {
    public void run() {
        // 执行方法1的代码
    }
});

executor.submit(new Runnable() {
    public void run() {
        // 执行方法2的代码
    }
});

executor.shutdown();

1. Using CompletableFuture: Java 8 introduced the CompletableFuture class, which provides a convenient way to execute multiple methods in parallel. This can be done by using the static method supplyAsync() to execute a method, and then using the thenAccept() method to specify the execution of the next method.

CompletableFuture<Void> future1 = CompletableFuture.runAsync(() -> {
    // 执行方法1的代码
});

CompletableFuture<Void> future2 = future1.thenRun(() -> {
    // 执行方法2的代码
});

future2.join();

These are some common ways to execute multiple methods in parallel. Choose the appropriate method based on specific needs and scenarios to achieve parallel execution.