java 使用lambda表达式创建线程

        Thread t = new Thread(() -> {
            for (int i = 0; i < 5; i++) {
                System.out.println(Thread.currentThread().getName() + " " + i);
                System.out.println("Hello world");
            }
        });
        t.start();

        Runnable r = () -> {
            for (int i = 0; i < 5; i++) {
                System.out.println(Thread.currentThread().getName() + " " + i);
                System.out.println("Hello world");
            }
        };
        r.run();