Question 1

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 these are true.

Question 2

In __________, inheritance is shown with a line that has an open arrowhead at one end that points to the superclass.

Accepted Answer

A)   pseudocode
B)   a UML diagram
C)   a CRC card
D)   a hierarchy chart

Question 3

A subclass can directly access __________.

Accepted Answer

A)   only protected and private members of the superclass
B)   all members of the superclass
C)   only public and private members of the superclass
D)   only public and protected members of the superclass

Question 4

Given the following code, which statement is true? public class ClassB implements ClassA{ }

Accepted Answer

A)   ClassA must override each method in ClassB.
B)   ClassB must override each method in ClassA.
C)   ClassB inherits from ClassA.
D)   ClassA inherits from ClassB.

Question 5

When a subclass overloads a superclass method __________.

Accepted Answer

A)   both methods may be called with a subclass object
B)   only the subclass method may be called with a subclass object
C)   only the superclass method may be called with a subclass object
D)   neither method may be called with a subclass object

Question 6

__________ is a special type of expression used to create an object that implements a functional interface.

Accepted Answer

A)   lambda
B)   beta
C)   alpha
D)   sigma

Question 7

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 top

Question 8

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

Accepted Answer

A)   ClassA
B)   ClassB
C)   ClassC
D)   cannot tell

Question 9

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)   isa

Question 10

In the following code, what will the call to super do? public class ClassB extends ClassA
{
Public ClassB() 
{
Super(40) ;
System.out.println("This is the last statement "+
"in the constructor.") ;
}
}

Accepted Answer

A)   This cannot be determined from the code.
B)   It will call the method super and pass the value 40 to it as an argument.
C)   It will call the constructor of ClassA that receives an integer as an argument.
D)   The method super will have to be defined before we can say what will happen. C

Question 11

When a method is declared with the __________ modifier, it cannot be overridden in a subclass.

Accepted Answer

A)   final
B)   super
C)   void
D)   public

Question 12

A class becomes abstract when you place the __________ key word in the class definition.

Accepted Answer

A)   super
B)   extends
C)   final
D)   abstract

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 classes

Question 14

Inheritance involves a subclass, which is the general class, and a superclass, which is the specialized class.

Accepted Answer

A) True 
 B)False

Question 15

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 characteristics

Question 16

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

Accepted Answer

A) True 
 B)False  False

Question 17

A functional interface is simply an interface that has one abstract method.

Accepted Answer

A) True 
 B)False

Question 18

A protected member of a class may be directly accessed by __________.

Accepted Answer

A)   methods of the same class
B)   methods of a subclass
C)   methods in the same package
D)   Any of these

Question 19

Because the subclass is more specialized than the superclass, it is sometimes necessary for the subclass to replace inadequate superclass methods with more suitable ones.

Accepted Answer

A) True 
 B)False

Question 20

What type of relationship exists between two objects when one object is a specialized version of another object?

Accepted Answer

A)   "is a"
B)   "contains a"
C)   "has a"
D)   "consists of" A

Exam 10: Inheritance

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

Correct AnswerverifiedShow Answer

In __________, inheritance is shown with a line that has an open arrowhead at one end that points to the superclass.

Correct AnswerverifiedShow Answer

A subclass can directly access __________.

Correct AnswerverifiedShow Answer

Given the following code, which statement is true? public class ClassB implements ClassA{ }

Correct AnswerverifiedShow Answer

When a subclass overloads a superclass method __________.

Correct AnswerverifiedShow Answer

__________ is a special type of expression used to create an object that implements a functional interface.

Correct AnswerverifiedShow Answer

In a class hierarchy __________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In the following code, what will the call to super do? public class ClassB extends ClassA { Public ClassB() { Super(40) ; System.out.println("This is the last statement "+ "in the constructor.") ; } }

Correct AnswerverifiedC

When a method is declared with the __________ modifier, it cannot be overridden in a subclass.

Correct AnswerverifiedShow Answer

A class becomes abstract when you place the __________ key word in the class definition.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Inheritance involves a subclass, which is the general class, and a superclass, which is the specialized class.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedFalse

A functional interface is simply an interface that has one abstract method.

Correct AnswerverifiedShow Answer

A protected member of a class may be directly accessed by __________.

Correct AnswerverifiedShow Answer

Because the subclass is more specialized than the superclass, it is sometimes necessary for the subclass to replace inadequate superclass methods with more suitable ones.

Correct AnswerverifiedShow Answer

What type of relationship exists between two objects when one object is a specialized version of another object?

Correct AnswerverifiedA

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C

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False

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A