Java创建线程有哪几种方式？

在 Java 中，创建线程有多种方式，主要包括使用 Thread 类和实现 Runnable 接口。以下是几种常见的创建线程的方式：

继承 Thread 类：

通过继承 Thread 类并重写 run 方法来创建线程。

class MyThread extends Thread {public void run() {for (int i = 0; i < 5; i++) {System.out.println(Thread.currentThread().getName() + ": " + i);}}
}public class ThreadExample {public static void main(String[] args) {MyThread thread1 = new MyThread();MyThread thread2 = new MyThread();thread1.start();thread2.start();}
}

实现 Runnable 接口：

通过实现 Runnable 接口并将其传递给 Thread 类来创建线程。这种方式更灵活，因为一个类可以实现多个接口，而 Java 中是单继承的。

class MyRunnable implements Runnable {public void run() {for (int i = 0; i < 5; i++) {System.out.println(Thread.currentThread().getName() + ": " + i);}}
}public class RunnableExample {public static void main(String[] args) {MyRunnable myRunnable = new MyRunnable();Thread thread1 = new Thread(myRunnable);Thread thread2 = new Thread(myRunnable);thread1.start();thread2.start();}
}

使用匿名类：

通过匿名类创建线程，适用于一次性使用的情况。

public class AnonymousThreadExample {public static void main(String[] args) {Thread thread1 = new Thread(new Runnable() {public void run() {for (int i = 0; i < 5; i++) {System.out.println(Thread.currentThread().getName() + ": " + i);}}});thread1.start();}
}

使用 ExecutorService 框架：

使用 ExecutorService 框架可以更方便地管理和执行线程。

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;public class ExecutorServiceExample {public static void main(String[] args) {ExecutorService executorService = Executors.newFixedThreadPool(2);Runnable myRunnable = new Runnable() {public void run() {for (int i = 0; i < 5; i++) {System.out.println(Thread.currentThread().getName() + ": " + i);}}};executorService.submit(myRunnable);executorService.submit(myRunnable);executorService.shutdown();}
}