1.继承Thread类

class MyThread extends Thread {public void run() {// 线程执行的任务for (int i = 0; i < 5; i++) {System.out.println("Thread: " + i);try {Thread.sleep(1000); // 使线程休眠 1 秒} catch (InterruptedException e) {e.printStackTrace();}}}
}public class Main {public static void main(String[] args) {MyThread thread = new MyThread();thread.start(); // 启动线程}
}

2.实现Runnable接口

class MyRunnable implements Runnable {public void run() {// 线程执行的任务for (int i = 0; i < 5; i++) {System.out.println("Runnable: " + i);try {Thread.sleep(1000); // 使线程休眠 1 秒} catch (InterruptedException e) {e.printStackTrace();}}}
}public class Main {public static void main(String[] args) {MyRunnable myRunnable = new MyRunnable();Thread thread = new Thread(myRunnable);thread.start(); // 启动线程}
}

3.实现callable接口

import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;public class Main {public static void main(String[] args) {// 创建 Callable 实例Callable<Integer> callable = new MyCallable();// 使用 FutureTask 包装 Callable 实例FutureTask<Integer> futureTask = new FutureTask<>(callable);// 创建线程并启动Thread thread = new Thread(futureTask);thread.start();try {// 获取线程执行结果，这里会阻塞直到线程执行完成并返回结果int result = futureTask.get();System.out.println("Result: " + result);} catch (Exception e) {e.printStackTrace();}}
}// 实现 Callable 接口
class MyCallable implements Callable<Integer> {public Integer call() throws Exception {int sum = 0;for (int i = 1; i <= 10; i++) {sum += i;}return sum;}
}

4.使用匿名内部类

public class Main {public static void main(String[] args) {Runnable myRunnable = new Runnable() {public void run() {// 线程执行的任务for (int i = 0; i < 5; i++) {System.out.println("Anonymous Runnable: " + i);try {Thread.sleep(1000); // 使线程休眠 1 秒} catch (InterruptedException e) {e.printStackTrace();}}}};Thread thread = new Thread(myRunnable);thread.start(); // 启动线程}
}

5.使用Lambda表达式

public class Main {public static void main(String[] args) {Runnable myRunnable = () -> {// 线程执行的任务for (int i = 0; i < 5; i++) {System.out.println("Lambda Runnable: " + i);try {Thread.sleep(1000); // 使线程休眠 1 秒} catch (InterruptedException e) {e.printStackTrace();}}};Thread thread = new Thread(myRunnable);thread.start(); // 启动线程}
}