Question 1

A motorcycle inherits properties from both a bicycle and a car. Java does not permit multiple inheritance. Assume that Bicycle and Car have both been declared. Explain how you might go about implementing a Motorcycle as a derived class.

Accepted Answer

You should extend whichever class is clo...

Question 2

Explain the difference between implementing an interface and a derived class.

Accepted Answer

Implementing an interface means that you...

Question 3

For the questions below, consider the following class definition:
public class AClass
{
protected int x;
protected int y;
public AClass(int a, int b) 
{
x = a;
y = b;
}
public int addEm( ) 
{
return x + y;
}
public void changeEm( ) 
{
x++;
y--;
}
public String toString( ) 
{
return "" + x + " " + y;
}
}
-Consider that you want to extend AClass to BClass. BClass will have a third int instance data, z. Which of the following would best define BClass'constructor?

Accepted Answer

A)   public BClass(int a, int b, int c)  {Super(a, b, c) ;}
B)   public BClass(int a, int b, int c)  {X = a;Y = b;Z = c;}
C)   public BClass(int a, int b, int c)  {Z = c;}
D)   public BClass(int a, int b, int c)  {Super(a, b) ;Z = c;}
E)   public BClass(int a, int b, int c)  {Super( ) ;}F) B) and D)
G) A) and D)

Question 4

In what manners are Timer objects similar to and different from other GUI components?

Accepted Answer

Timer objects are declared within the ja...

Question 5

The reserved word, extends, is used to denote a has-a relationship.

Accepted Answer

A) True 
 B)False

Question 6

Inheritance through an extended (derived)  class supports which of the following concepts?

Accepted Answer

A)   interfaces
B)   modulary
C)   information hiding
D)   code reuse
E)   correctnessF) All of the above
G) B) and D)

Question 7

Using the reserved word, super, one can

Accepted Answer

A)   access a parent class'constructor(s) 
B)   access a parent class'methods and instance data
C)   access a child class'constructor(s) 
D)   access a child class'methods and instance data
E)   none of the aboveF) A) and E)
G) C) and E)

Question 8

What methods inherited from Car should SportsCar override?

Accepted Answer

Because a SportsCar will have different ...

Question 9

If A, B, Y and Z all contain the same instance data d1, then d1 should be declared in X and inherited into Y, Z, A and B.

Accepted Answer

A) True 
 B)False

Question 10

Two children of the same parent class are known as

Accepted Answer

A)   aliases
B)   relatives
C)   clones
D)   brothers
E)   siblingsF) B) and D)
G) All of the above

Question 11

Which of the following is not a method of the Object class?

Accepted Answer

A)   clone
B)   compareTo
C)   equals
D)   toString
E)   all of the above are methods of the Object classF) A) and E)
G) D) and E)

Exam 9: Inheritance

Correct Answer
verified

Which of the following is not a method of the Object class?

Correct Answer
verified

If A, B, Y and Z all contain the same instance data d1, then d1 should be declared in X and inherited into Y, Z, A and B.

Correct Answer
verified

Using the reserved word, super, one can

Correct Answer
verified

Two children of the same parent class are known as

Correct Answer
verified

Explain the difference between implementing an interface and a derived class.

Correct Answer
verified
Implementing an interface means that you...
View Answer

A motorcycle inherits properties from both a bicycle and a car. Java does not permit multiple inheritance. Assume that Bicycle and Car have both been declared. Explain how you might go about implementing a Motorcycle as a derived class.

Correct Answer
verified
You should extend whichever class is clo...
View Answer

Inheritance through an extended (derived) class supports which of the following concepts?

Correct Answer
verified

In what manners are Timer objects similar to and different from other GUI components?

Correct Answer
verified
Timer objects are declared within the ja...
View Answer

What methods inherited from Car should SportsCar override?

Correct Answer
verified
Because a SportsCar will have different ...
View Answer

The reserved word, extends, is used to denote a has-a relationship.

Correct Answer
verified

Exam 9: Inheritance

Correct AnswerverifiedShow Answer

Which of the following is not a method of the Object class?

Correct AnswerverifiedShow Answer

If A, B, Y and Z all contain the same instance data d1, then d1 should be declared in X and inherited into Y, Z, A and B.

Correct AnswerverifiedShow Answer

Using the reserved word, super, one can

Correct AnswerverifiedShow Answer

Two children of the same parent class are known as

Correct AnswerverifiedShow Answer

Explain the difference between implementing an interface and a derived class.

Correct AnswerverifiedImplementing an interface means that you...View AnswerShow Answer

A motorcycle inherits properties from both a bicycle and a car. Java does not permit multiple inheritance. Assume that Bicycle and Car have both been declared. Explain how you might go about implementing a Motorcycle as a derived class.

Correct AnswerverifiedYou should extend whichever class is clo...View AnswerShow Answer

Inheritance through an extended (derived) class supports which of the following concepts?

Correct AnswerverifiedShow Answer

In what manners are Timer objects similar to and different from other GUI components?

Correct AnswerverifiedTimer objects are declared within the ja...View AnswerShow Answer

What methods inherited from Car should SportsCar override?

Correct AnswerverifiedBecause a SportsCar will have different ...View AnswerShow Answer

The reserved word, extends, is used to denote a has-a relationship.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Implementing an interface means that you...
View Answer

Correct Answer
verified
You should extend whichever class is clo...
View Answer

Correct Answer
verified

Correct Answer
verified
Timer objects are declared within the ja...
View Answer

Correct Answer
verified
Because a SportsCar will have different ...
View Answer

Correct Answer
verified