下列代码利用继承Thread类实现线程的创建，运行结果如下图所示。根据运行结果利用实现Runnable接口的任务类、匿名类和Lambda表达式改写下面的代码实现相同的功能。 public class ThreadDemo extends Thread { public void run() { for (int i = 0; i < 100; i++) { // 继承Thread类时，直接使用this即可获取当前线程对象 // 调用getName()方法返回当前线程的名字 System.out.println(this.getName() + " : " + i); } } public static void main(String[] args)throws Exception { ThreadDemo td = new ThreadDemo(); td.start(); td.join(); // 主线程任务 for (int i = 1000; i < 1100; i++) { // 使用Thread.currentThread().getName()获取主线程名字 System.out.println(Thread.currentThread().getName() + " : " + i); } } }

使用实现Runnable接口的任务类改写代码如下：

public class RunnableDemo implements Runnable {
    public void run() {
        for (int i = 0; i < 100; i++) {
            System.out.println(Thread.currentThread().getName() + " : " + i);
        }
    }
    public static void main(String[] args) throws Exception {
        RunnableDemo rd = new RunnableDemo();
        Thread t = new Thread(rd);
        t.start();
        t.join();
        for (int i = 1000; i < 1100; i++) {
            System.out.println(Thread.currentThread().getName() + " : " + i);
        }
    }
}

使用匿名类改写代码如下：

public class AnonymousDemo {
    public static void main(String[] args) throws Exception {
        Thread t = new Thread(new Runnable() {
            public void run() {
                for (int i = 0; i < 100; i++) {
                    System.out.println(Thread.currentThread().getName() + " : " + i);
                }
            }
        });
        t.start();
        t.join();
        for (int i = 1000; i < 1100; i++) {
            System.out.println(Thread.currentThread().getName() + " : " + i);
        }
    }
}

使用Lambda表达式改写代码如下：

public class LambdaDemo {
    public static void main(String[] args) throws Exception {
        Thread t = new Thread(() -> {
            for (int i = 0; i < 100; i++) {
                System.out.println(Thread.currentThread().getName() + " : " + i);
            }
        });
        t.start();
        t.join();
        for (int i = 1000; i < 1100; i++) {
            System.out.println(Thread.currentThread().getName() + " : " + i);
        }
    }
}