Question 1

If you do not provide an access specifier for a class member, the class member is given ________ by default.

Accepted Answer

A)  private 
B)  public 
C)  protected 
D)  package 
A)  private 
B)  public 
C)  protected 
D)  package

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

If ClassA extends ClassB, then:

Accepted Answer

A)  public and private members of ClassB are public and private, respectively, in ClassA 
B)  public members in ClassB are public in ClassA, but private members in ClassB cannot be directly accessed in ClassA 
C)  neither public or private members in ClassB can be directly accessed in ClassA 
D)  private members in ClassB are changed to protected members in ClassA 
A)  public and private members of ClassB are public and private, respectively, in ClassA 
B)  public members in ClassB are public in ClassA, but private members in ClassB cannot be directly accessed in ClassA 
C)  neither public or private members in ClassB can be directly accessed in ClassA 
D)  private members in ClassB are changed to protected members in ClassA

Question 4

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

Accepted Answer

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

Question 5

Given the following code which of the following 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. 
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 6

Look at the following code. Which line has an error?
Line 1 public interface Interface1
Line 2 {
Line 3 int FIELDA = 55;
Line 4 public int methodA(double){}
Line 5 }

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 7

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

Accepted Answer

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

Question 8

In an interface all methods have:

Accepted Answer

A)  private access 
B)  protected access 
C)  public access 
D)  packaged access 
A)  private access 
B)  protected access 
C)  public access 
D)  packaged access

Question 9

In a class hierarchy:

Accepted Answer

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

Question 10

A subclass may call an overridden superclass method by:

Accepted Answer

A)  prefixing its name with the super key word and a dot (.) 
B)  prefixing its name with the name of the superclass in parentheses 
C)  using the extends keyword before the method is called 
D)  calling the superclass method first and then calling the subclass method 
A)  prefixing its name with the super key word and a dot (.) 
B)  prefixing its name with the name of the superclass in parentheses 
C)  using the extends keyword before the method is called 
D)  calling the superclass method first and then calling the subclass method

Question 11

Look at the following code: Line 1 public class ClassA
Line 2 {
Line 3 public ClassA() {}
Line 4 public void method1(int a){}
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 method will be executed when the following statements are executed?
ClassC item1 = new ClassA();
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 12

This is a variable whose value is never changed, but it isn't declared with the final key word.

Accepted Answer

A)  virtually constant variable 
B)  effectively final variable 
C)  default variable 
D)  anonymous inner variable 
A)  virtually constant variable 
B)  effectively final variable 
C)  default variable 
D)  anonymous inner variable

Question 13

Look at the following code. The method in line ________ will override the method in line ________. Line 1 public class ClassA
Line 2 {
Line 3 public ClassA() {}
Line 4 public int method1(int a){}
Line 5 public int 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 int method2(double c){}
Line 12 }

Accepted Answer

A)  4, 10 
B)  5, 11 
C)  10, 4 
D)  11, 5 
E)  Both A and B 
A)  4, 10 
B)  5, 11 
C)  10, 4 
D)  11, 5 
E)  Both A and B

Question 14

Which of the following is TRUE about protected access?

Accepted Answer

A)  Protected members may be accessed by methods in the same package or in a subclass, even when the subclass is in a different package. 
B)  Protected members may be accessed by methods in the same package or in a subclass, but only if the subclass is in the same package. 
C)  Protected members cannot be accessed by methods in any other classes. 
D)  Protected members are actually named constants. 
A)  Protected members may be accessed by methods in the same package or in a subclass, even when the subclass is in a different package. 
B)  Protected members may be accessed by methods in the same package or in a subclass, but only if the subclass is in the same package. 
C)  Protected members cannot be accessed by methods in any other classes. 
D)  Protected members are actually named constants.

Question 15

Look at the following code. What is missing from ClassA?
Line 1 public interface MyInterface
Line 2 {
Line 3 int FIELDA = 55;
Line 4 public int methodA(double);
Line 5 }
Line 6 public class ClassA implements MyInterface
Line 7 {
Line 8 FIELDA = 60;
Line 9 public int methodB(double) { }
Line 10 }

Accepted Answer

A)  It does not override methoda. 
B)  It does not have a constructor. 
C)  It does not overload methoda. 
D)  Nothing is missing. It is a complete class. 
A)  It does not override methoda. 
B)  It does not have a constructor. 
C)  It does not overload methoda. 
D)  Nothing is missing. It is a complete class.

Question 16

What is wrong with the following code?
IntCalculator square = new IntCalculator() {
Public int calculate(int number)
{
Return number * number;
}}

Accepted Answer

A)  The outer braces are not needed. 
B)  The inner braces are not needed. 
C)  The new key word is not needed. 
D)  The statement does not end with a semicolon. 
A)  The outer braces are not needed. 
B)  The inner braces are not needed. 
C)  The new key word is not needed. 
D)  The statement does not end with a semicolon.

Question 17

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

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

If ClassC extends ClassB, which extends ClassA, this would be an example of:

Accepted Answer

A)  multiple inheritance 
B)  a chain of inheritance 
C)  a family tree 
D)  packaging 
A)  multiple inheritance 
B)  a chain of inheritance 
C)  a family tree 
D)  packaging

Question 20

What key word can you use to call a superclass constructor explicitly?

Accepted Answer

A)  goto 
B)  this 
C)  super 
D)  extends 
A)  goto 
B)  this 
C)  super 
D)  extends

If you do not provide an access specifier for a class member, the class member is given ________ by default.

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

If ClassA extends ClassB, then:

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

Given the following code which of the following is TRUE? Public class ClassB implements ClassA{}

Look at the following code. Which line has an error? Line 1 public interface Interface1 Line 2 { Line 3 int FIELDA = 55; Line 4 public int methodA(double){} Line 5 }

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

In an interface all methods have:

In a class hierarchy:

A subclass may call an overridden superclass method by:

This is a variable whose value is never changed, but it isn't declared with the final key word.

Which of the following is TRUE about protected access?

Look at the following code. What is missing from ClassA? Line 1 public interface MyInterface Line 2 { Line 3 int FIELDA = 55; Line 4 public int methodA(double); Line 5 } Line 6 public class ClassA implements MyInterface Line 7 { Line 8 FIELDA = 60; Line 9 public int methodB(double) { } Line 10 }

What is wrong with the following code? IntCalculator square = new IntCalculator() { Public int calculate(int number) { Return number * number; }}

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

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

If ClassC extends ClassB, which extends ClassA, this would be an example of:

What key word can you use to call a superclass constructor explicitly?

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

If you do not provide an access specifier for a class member, the class member is given ________ by default.

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

If ClassA extends ClassB, then:

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

Given the following code which of the following is TRUE? Public class ClassB implements ClassA{}

Look at the following code. Which line has an error? Line 1 public interface Interface1 Line 2 { Line 3 int FIELDA = 55; Line 4 public int methodA(double){} Line 5 }

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

In an interface all methods have:

In a class hierarchy:

A subclass may call an overridden superclass method by:

This is a variable whose value is never changed, but it isn't declared with the final key word.

Which of the following is TRUE about protected access?

Look at the following code. What is missing from ClassA? Line 1 public interface MyInterface Line 2 { Line 3 int FIELDA = 55; Line 4 public int methodA(double); Line 5 } Line 6 public class ClassA implements MyInterface Line 7 { Line 8 FIELDA = 60; Line 9 public int methodB(double) { } Line 10 }

What is wrong with the following code? IntCalculator square = new IntCalculator() { Public int calculate(int number) { Return number * number; }}

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

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

If ClassC extends ClassB, which extends ClassA, this would be an example of:

What key word can you use to call a superclass constructor explicitly?

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