Question 1

When a class does not use the extends key word to inherit from another class, Java automatically extends it from the __________ class.

Accepted Answer

A)   Object
B)   subclass
C)   superclass
D)   publicE) A) and C)
F) B) and C)

Question 2

In an inheritance relationship, the subclass constructor always executes before the superclass constructor.

Accepted Answer

A) True 
 B)False

Question 3

When a class implements an interface, an inheritance relationship known as __________ inheritance is established.

Accepted Answer

A)   implemented
B)   interface
C)   realized
D)   abstractE) C) and D)
F) A) and B)

Question 4

If you don't provide an access specifier for a class member, the class member is given __________ access by default.

Accepted Answer

A)   private
B)   public
C)   protected
D)   packageE) B) and D)
F) A) and B) D

Question 5

Which of the following shows the inheritance relationships among classes in a manner similar to that of a family tree.

Accepted Answer

A)   UML diagram
B)   CRC card
C)   flowchart
D)   class hierarchyE) B) and C)
F) A) and B)

Question 6

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

Accepted Answer

A)   the superclass's fields will be set to the default values for their data types
B)   Java will automatically call the superclass's default constructor immediately after the code in the subclass's constructor executes
C)   it must include the code necessary to initialize the superclass fields
D)   Java will automatically call the superclass's default constructor just before the code in the subclass's constructor executesE) A) and B)
F) All of the above

Question 7

All fields declared in an interface

Accepted Answer

A)   have protected access
B)   must be initialized in the class implementing the interface
C)   have private access
D)   are treated as final and staticE) B) and D)
F) A) and D)

Question 8

Because every class directly or indirectly inherits from the Object class, every class inherits the Object class's members.

Accepted Answer

A) True 
 B)False

Question 9

An abstract class is not instantiated itself but serves as a superclass for other classes.

Accepted Answer

A) True 
 B)False  True

Question 10

If a method in a subclass has the same signature as a method in the superclass, the subclass method __________ the superclass method.

Accepted Answer

A)   inherits
B)   overloads
C)   overrides
D)   implementsE) All of the above
F) A) and B)

Question 11

Protected class members can be denoted in a UML diagram with the __________ symbol.

Accepted Answer

A)   +
B)   -
C)   *
D)   #E) A) and D)
F) B) and C)

Question 12

You can write a super statement that calls a superclass constructor but only in the subclass's constructor.

Accepted Answer

A) True 
 B)False

Question 13

If ClassC is derived from ClassB which is derived from ClassA, this would be an example of

Accepted Answer

A)   a chain of inheritance
B)   linear inheritance
C)   multiple interfaces
D)   cascading classesE) B) and C)
F) All of the above

Question 14

When an "is a" relationship exists between objects, the specialized object has

Accepted Answer

A)   some of the characteristics of the general class, but not all, plus additional characteristics
B)   some, but not all, of the characteristics of the general object
C)   none of the characteristics of the general object
D)   all of the characteristics of the general object plus additional characteristicsE) A) and B)
F) All of the above

Question 15

In the following statement, which is the subclass? 
public class ClassA extends ClassB implements ClassC

Accepted Answer

A)   ClassA
B)   ClassB
C)   ClassC
D)   both ClassB and ClassC are subclassesE) A) and B)
F) None of the above

Question 16

You show inheritance in a UML diagram by connecting two classes with a line that has an open arrowhead pointing to the subclass.

Accepted Answer

A) True 
 B)False

Question 17

A __________ member's access is somewhere between public and private.

Accepted Answer

A)   package
B)   protected
C)   static
D)   finalE) A) and B)
F) None of the above

Question 18

Which of the following is the operator used to determine whether an object is an instance of a particular class?

Accepted Answer

A)   equals
B)   instanceOf
C)   >>
D)   isaE) C) and D)
F) B) and D) B

Question 19

In a class hierarchy

Accepted Answer

A)   the more general classes are toward the right of the tree and the more specialized classes are toward the left
B)   the more general classes are toward the top of the tree and the more specialized classes are toward the bottom
C)   the more general classes are toward the left of the tree and the more specialized classes are toward the right
D)   the more general classes are toward the bottom of the tree and the more specialized classes are toward the topE) All of the above
F) A) and B)

Question 20

In the following statement, which is the interface? public class ClassA extends ClassB implements ClassC

Accepted Answer

A)   ClassA
B)   ClassB
C)   ClassC
D)   all are interfacesE) None of the above
F) A) and D)

Exam 9: Inheritance

When a class does not use the extends key word to inherit from another class, Java automatically extends it from the __________ class.

Correct AnswerverifiedShow Answer

In an inheritance relationship, the subclass constructor always executes before the superclass constructor.

Correct AnswerverifiedShow Answer

When a class implements an interface, an inheritance relationship known as __________ inheritance is established.

Correct AnswerverifiedShow Answer

If you don't provide an access specifier for a class member, the class member is given __________ access by default.

Correct AnswerverifiedD

Which of the following shows the inheritance relationships among classes in a manner similar to that of a family tree.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

All fields declared in an interface

Correct AnswerverifiedShow Answer

Because every class directly or indirectly inherits from the Object class, every class inherits the Object class's members.

Correct AnswerverifiedShow Answer

An abstract class is not instantiated itself but serves as a superclass for other classes.

Correct AnswerverifiedTrue

If a method in a subclass has the same signature as a method in the superclass, the subclass method __________ the superclass method.

Correct AnswerverifiedShow Answer

Protected class members can be denoted in a UML diagram with the __________ symbol.

Correct AnswerverifiedShow Answer

You can write a super statement that calls a superclass constructor but only in the subclass's constructor.

Correct AnswerverifiedShow Answer

If ClassC is derived from ClassB which is derived from ClassA, this would be an example of

Correct AnswerverifiedShow Answer

When an "is a" relationship exists between objects, the specialized object has

Correct AnswerverifiedShow Answer

In the following statement, which is the subclass? public class ClassA extends ClassB implements ClassC

Correct AnswerverifiedShow Answer

You show inheritance in a UML diagram by connecting two classes with a line that has an open arrowhead pointing to the subclass.

Correct AnswerverifiedShow Answer

A __________ member's access is somewhere between public and private.

Correct AnswerverifiedShow Answer

Which of the following is the operator used to determine whether an object is an instance of a particular class?

Correct AnswerverifiedB

In a class hierarchy

Correct AnswerverifiedShow Answer

In the following statement, which is the interface? public class ClassA extends ClassB implements ClassC

Correct AnswerverifiedShow Answer

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D

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True

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B

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