以下哪一个选项能够实现“狗是人类的一个最好的朋友”？
A: class Man extends Dog { }
B: class Man { private BestFriend dog; }
C: class Man { private Dog bestFriend; }
D: class Man { private Dog; }
A: class Man extends Dog { }
B: class Man { private BestFriend dog; }
C: class Man { private Dog bestFriend; }
D: class Man { private Dog; }
举一反三
- 下列各种java类的定义，那种是错误的 A: class Animal{}class Dog extends Animal {} B: final class Animal{}class Dog extends Animal{} C: abstract class Animal{}class Dog extends Animal{} D: public class Animal{}class Dog extends Animal{}
- class Animal { public Animal() { System.out.println("Animal!"); } } public class Dog extends Animal{ public Dog() { System.out.println("Dog!"); } public static void main(String[] args) { Dog dog=new Dog(); } }
- 以下代码运行输出是（）class Man {private String n...println(m.name);}}
- "The dog bit the man" and "The man bit the dog" share the same meaning.
- （7-1）定义了Animal类、Cat类和Dog类，则代码段是正确的。 class Animal{ }; class Cat extends Animal{} class Dog extends Animal{}