public class TestUSB {
    public static void main(String[] args) {
        Computer c = new Computer();
        c.works(new USB() {//接口是没有构造器的，这里不能看作构造器，而是实现接口的匿名类
            @Override
            public void work() {
                System.out.println("====anonymous usb working====");
            }
        });
    }
}
class Computer {
    public void works(USB u) {
        u.work();
        System.out.println("====device working====");
    }
}
interface USB {
    void work();
}