【单选题】有一个接口定义如下,下列选项中实现了该接口并且不是抽象的是( )。interface A{ int method1 (int i); int method2 (int j);}
A.
class B implements A{ int method1() { } int method2() { }}
B.
class B{int method1(int i) { }int method2(int j) { }}
C.
class B implements A{ int methodl(int i) { } int method2(intj) { }}
D.
class B extends A{int method1(int i) { }int method2(int j) { }}
【判断题】字母 س 的末写体书写形式有一种。 ( )
【单选题】C51程序中,使用stc89c52单片机时,包含的头文件名称是( )
【简答题】A.She will talk to Judy about the problems. B.She isn't sure if Judy can solve the problems. C.She may not be able to help the man with the problems. D.The man should learn to solve the problems by hi...
【简答题】横刃斜角的大小由 决定。 大时,横刃斜角就减小,横刃变 ,横刃斜角一般为 。
【判断题】横刃斜角的大小由后角的大小决定。后角大时,横刃斜角小,横刃长;后角小时,情况相反。( )
【单选题】C语言中,关于自增和自减运算符使用正确的是:
【单选题】给定如图所示的车辆类 Vehicle 和可驾驶的 Drivable 接口之间的关系: 有关类和接口定义的代码如下: public interface Drivable{ } public class Vehicle{ } public class Car extends Vehicle implements Drivable{ } public class Truck extends Vehicl...
A.
Car car = new Car(); Vehicle vehicle = car;
B.
Tank tank = new Tank(); Vehicle vehicle = tank;
C.
Drivable drivable = new Tank(); Object o = drivable;
D.
Vehicle vehicle = new Vehicle(); Object o = vehicle;