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1.Which Man class properly represents the relationship “Man has a best friend who is a Dog”?
A.class Man extends Dog { }
B.class Man implements Dog { }
C.class Man { private BestFriend dog; }
D.class Man { private Dog bestFriend; }
E.class Man { private Dog; }
F.class Man { private BestFriend; }
Answer:DÂ
2.Given: 1. package test; 2. 3. class Target { 4. public String name = “hello”; 5. } What can directly access and change the value of the variable name?
A.any class
B.only the Target class
C.any class in the test package
D.any class that extends Target
Answer:C
3.Given: 10. interface Jumper { public void jump(); } … 20. class Animal {} … 30. class Dog extends Animal
{ 31. Tail tail; 32. } … 40. class Beagle extends Dog implements Jumper{ 41. public void jump() {} 42. } …
50. class Cat implements Jumper{ 51. public void jump() {} 52. } Which three are true? (Choose three.)
A.Cat is-a Animal
B.Cat is-a Jumper
C.Dog is-a Animal
D.Dog is-a Jumper
E.Cat has-a Animal
F.Beagle has-a Tail
G.Beagle has-a Jumper
Answer:B C FÂ
4.Given: 10: public class Hello { 11: String title; 12: int value; 13: public Hello() { 14: title += ” World”; 15: }
16: public Hello(int value) { 17: this.value = value; 18: title = “Hello”; 19: Hello(); 20: } 21: } and: 30: Hello c
= new Hello(5); 31: System.out.println(c.title); What is the result?
A.Hello
B.Hello World
C.Compilation fails.
D.Hello World 5
E.The code runs with no output.
F.An exception is thrown at runtime.
Answer:C