Java 多线程实现方式详解：Thread, Runnable, Callable, 线程池

实现多线程的方式有以下几种：\n\n1. 使用Thread类：创建一个Thread类的实例，重写run()方法，并调用start()方法启动线程。\n\njava\nclass MyThread extends Thread {\n public void run() {\n // 线程执行的代码\n }\n}\n\npublic class Main {\n public static void main(String[] args) {\n Thread thread = new MyThread();\n thread.start();\n }\n}\n\n\n2. 实现Runnable接口：创建一个实现了Runnable接口的类，重写run()方法，并将其传递给Thread类的构造方法创建线程对象。\n\njava\nclass MyRunnable implements Runnable {\n public void run() {\n // 线程执行的代码\n }\n}\n\npublic class Main {\n public static void main(String[] args) {\n Thread thread = new Thread(new MyRunnable());\n thread.start();\n }\n}\n\n\n3. 使用Callable和Future：创建一个实现了Callable接口的类，重写call()方法，并使用ExecutorService的submit()方法提交任务，返回一个Future对象。\n\njava\nimport java.util.concurrent.Callable;\nimport java.util.concurrent.ExecutorService;\nimport java.util.concurrent.Executors;\nimport java.util.concurrent.Future;\n\nclass MyCallable implements Callable<String> {\n public String call() throws Exception {\n // 线程执行的代码\n return "result";\n }\n}\n\npublic class Main {\n public static void main(String[] args) {\n ExecutorService executorService = Executors.newFixedThreadPool(1);\n Future<String> future = executorService.submit(new MyCallable());\n try {\n String result = future.get();\n } catch (Exception e) {\n e.printStackTrace();\n }\n executorService.shutdown();\n }\n}\n\n\n4. 使用线程池：使用ExecutorService创建一个线程池，通过submit()方法提交任务给线程池执行。\n\njava\nimport java.util.concurrent.ExecutorService;\nimport java.util.concurrent.Executors;\n\npublic class Main {\n public static void main(String[] args) {\n ExecutorService executorService = Executors.newFixedThreadPool(5);\n for (int i = 0; i < 5; i++) {\n executorService.submit(new Runnable() {\n public void run() {\n // 线程执行的代码\n }\n });\n }\n executorService.shutdown();\n }\n}\n