Question 1

When declaring class data members, it is best to declare them as:

Accepted Answer

A)  private members 
B)  public members 
C)  protected members 
D)  restricted members 
A)  private members 
B)  public members 
C)  protected members 
D)  restricted members

Question 2

Look at the following code. Which line will cause a compiler error?
Line 1 public class ClassA
Line 2 {
Line 3 public ClassA() {}
Line 4 public final int method1(int a){}
Line 5 public double method2(int b){}
Line 6 }
Line 7 public ClassB extends ClassA
Line 8 {
Line 9 public ClassB(){}
Line 10 public int method1(int b){}
Line 11 public double method2(double c){}
Line 12 }

Accepted Answer

A)  4 
B)  5 
C)  10 
D)  11 
A)  4 
B)  5 
C)  10 
D)  11

Question 3

When an interface variable references an object, you can use the interface variable to call any and all of the methods in the class implementing the interface.

Accepted Answer

A) True 
 B)False

Question 4

Look at the following code. Line 1 public class ClassA
Line 2 {
Line 3 public ClassA() {}
Line 4 public void method1(){}
Line 5 }
Line 6 public class ClassB extends ClassA
Line 7 {
Line 8 public ClassB(){}
Line 9 public void method1(){}
Line 10 }
Line 11 public class ClassC extends ClassB
Line 12 {
Line 13 public ClassC(){}
Line 14 public void method1(){}
Line 15 }
Which method1 will be executed as a result of the following statements?
ClassA item1 = new ClassC();
Item1.method1();

Accepted Answer

A)  Line 4 
B)  Line 9 
C)  Line 14 
D)  This is an error and will cause the program to crash. 
A)  Line 4 
B)  Line 9 
C)  Line 14 
D)  This is an error and will cause the program to crash.

Question 5

If a superclass does not have a default constructor or a no-arg constructor:

Accepted Answer

A)  then a class that inherits from it, must initialize the superclass values. 
B)  then a class that inherits from it, must call one of the constructors that the superclass does have. 
C)  then a class that inherits from it, does not inherit the data member fields from the superclass. 
D)  then a class that inherits from it, must contain the default constructor for the superclass. 
A)  then a class that inherits from it, must initialize the superclass values. 
B)  then a class that inherits from it, must call one of the constructors that the superclass does have. 
C)  then a class that inherits from it, does not inherit the data member fields from the superclass. 
D)  then a class that inherits from it, must contain the default constructor for the superclass.

Question 6

If a subclass constructor does not explicitly call a superclass constructor:

Accepted Answer

A)  it must include the code necessary to initialize the superclass fields 
B)  the superclass fields will be set to the default values for their data types 
C)  Java will automatically call the superclass's default or no-arg constructor immediately after the code in the subclass's constructor executes 
D)  Java will automatically call the superclass's default or no-arg constructor just before the code in the subclass's constructor executes 
A)  it must include the code necessary to initialize the superclass fields 
B)  the superclass fields will be set to the default values for their data types 
C)  Java will automatically call the superclass's default or no-arg constructor immediately after the code in the subclass's constructor executes 
D)  Java will automatically call the superclass's default or no-arg constructor just before the code in the subclass's constructor executes

Question 7

All methods in an abstract class must also be declared abstract.

Accepted Answer

A) True 
 B)False

Question 8

If two methods have the same name but different signatures, they are:

Accepted Answer

A)  overridden 
B)  overloaded 
C)  superclass methods 
D)  subclass methods 
A)  overridden 
B)  overloaded 
C)  superclass methods 
D)  subclass methods

Question 9

When a subclass extends a superclass, the public members of the superclass become public members of the subclass.

Accepted Answer

A) True 
 B)False

Question 10

What is required for an interface method that has a body?

Accepted Answer

A)  The method header must begin with the key word default. 
B)  A class that implements the interface must override the method. 
C)  The @Default annotation must precede the method header. 
D)  All of the above 
A)  The method header must begin with the key word default. 
B)  A class that implements the interface must override the method. 
C)  The @Default annotation must precede the method header. 
D)  All of the above

When declaring class data members, it is best to declare them as:

When an interface variable references an object, you can use the interface variable to call any and all of the methods in the class implementing the interface.

If a superclass does not have a default constructor or a no-arg constructor:

If a subclass constructor does not explicitly call a superclass constructor:

All methods in an abstract class must also be declared abstract.

If two methods have the same name but different signatures, they are:

When a subclass extends a superclass, the public members of the superclass become public members of the subclass.

What is required for an interface method that has a body?

Introduction to Computers and Java

Java Fundamentals

Decision Structures

Loops and Files

Methods

A First Look at Classes

Arrays and the Arraylist Class

A Second Look at Classes and Objects

Text Processing and More About Wrapper Classes

Exceptions and Advanced File IO

A First Look at GUI Applications

Advanced GUI Applications

Applets and More

Creating GUI Applications With Javafx and Scene Builder

Recursion

Databases

Filters

Exam 10: Inheritance

When declaring class data members, it is best to declare them as:

When an interface variable references an object, you can use the interface variable to call any and all of the methods in the class implementing the interface.

If a superclass does not have a default constructor or a no-arg constructor:

If a subclass constructor does not explicitly call a superclass constructor:

All methods in an abstract class must also be declared abstract.

If two methods have the same name but different signatures, they are:

When a subclass extends a superclass, the public members of the superclass become public members of the subclass.

What is required for an interface method that has a body?

Introduction to Computers and Java

Java Fundamentals

Decision Structures

Loops and Files

Methods

A First Look at Classes

Arrays and the Arraylist Class

A Second Look at Classes and Objects

Text Processing and More About Wrapper Classes

Exceptions and Advanced File IO

A First Look at GUI Applications

Advanced GUI Applications

Applets and More

Creating GUI Applications With Javafx and Scene Builder

Recursion

Databases

Filters