java多线程使用代码

Java多线程是通过Thread类或Runnable接口来创建和管理线程的。以下是一个简单的Java多线程示例，展示了如何通过继承Thread类和实现Runnable接口创建新线程：

**1. 继承Thread类的例子：**

public class MyThread extends Thread {
    public void run() {
        // 这里是线程执行的任务
        System.out.println("Thread " + this.getName() + " is running.");
    }

    public static void main(String[] args) {
        MyThread thread1 = new MyThread();
        thread1.setName("Thread 1");
        thread1.start();

        MyThread thread2 = new MyThread();
        thread2.setName("Thread 2");
        thread2.start();
    }
}

**2. 实现Runnable接口的例子：**

public class MyRunnable implements Runnable {
    private String name;

    public MyRunnable(String name) {
        this.name = name;
    }

    @Override
    public void run() {
        System.out.println("Thread " + name + " is running.");
    }

    public static void main(String[] args) {
        Thread thread1 = new Thread(new MyRunnable("Thread 1"));
        thread1.start();

        Thread thread2 = new Thread(new MyRunnable("Thread 2"));
        thread2.start();
    }
}

在这些例子中，`run()`方法包含了线程的实际任务，`start()`方法用于启动线程。同时，你可以通过`setName()`方法为线程设置名称，以便于识别。