Question 1

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

Accepted Answer

Timer objects are declared within the ja

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

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

Question 4

Two children of the same parent class are known as

Accepted Answer

A)  aliases 
B)  relatives 
C)  clones 
D)  brothers 
E)  siblings 
A)  aliases 
B)  relatives 
C)  clones 
D)  brothers 
E)  siblings

Question 5

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 6

What methods inherited from Car should SportsCar override?

Accepted Answer

Because a SportsCar will have different

Question 7

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)  correctness 
A)  interfaces 
B)  modulary 
C)  information hiding 
D)  code reuse 
E)  correctness

Question 8

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( );
} 
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( );
}

Question 9

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

Accepted Answer

Implementing an interface means that you

Question 10

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 11

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 above 
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 above

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

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

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

Two children of the same parent class are known as

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.

What methods inherited from Car should SportsCar override?

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

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

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.

Using the reserved word, super, one can

Introduction

Data and Expressions

Using Classes and Objects

Writing Classes

Conditionals and Loops

More Conditionals and Loops

Object-Oriented Design

Arrays

Polymorphism

Exceptions

Recursion

Collections

Filters

Exam 9: Inheritance

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

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

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

Two children of the same parent class are known as

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.

What methods inherited from Car should SportsCar override?

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

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

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.

Using the reserved word, super, one can

Introduction

Data and Expressions

Using Classes and Objects

Writing Classes

Conditionals and Loops

More Conditionals and Loops

Object-Oriented Design

Arrays

Polymorphism

Exceptions

Recursion

Collections

Filters