Question 1

When one object is a specialized version of another object, there is this type of relationship between them.

Accepted Answer

A)  "has a" 
B)  "is a" 
C)  direct 
D)  "contains a" 
A)  "has a" 
B)  "is a" 
C)  direct 
D)  "contains a" B

Question 2

In UML diagrams, inheritance is shown:

Accepted Answer

A)  With a line that has an open arrowhead at one end that points to the superclass 
B)  With a line that has an open arrowhead at one end that points to the subclass 
C)  With a line that has a closed arrowhead at one end that points to the superclass 
D)  With a line that has a closed arrowhead at one end that points to the subclass 
A)  With a line that has an open arrowhead at one end that points to the superclass 
B)  With a line that has an open arrowhead at one end that points to the subclass 
C)  With a line that has a closed arrowhead at one end that points to the superclass 
D)  With a line that has a closed arrowhead at one end that points to the subclass A

Question 3

It is not possible for a superclass to call a subclass's method.

Accepted Answer

A) True 
 B)False  True

Question 4

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. 
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.

Question 5

In an inheritance relationship:

Accepted Answer

A)  The superclass constructor always executes before the subclass constructor 
B)  The subclass constructor always executes before the superclass constructor 
C)  The constructor with the lowest overhead always executes first regardless of inheritance 
D)  The unified constructor always executes first regardless of inheritance 
A)  The superclass constructor always executes before the subclass constructor 
B)  The subclass constructor always executes before the superclass constructor 
C)  The constructor with the lowest overhead always executes first regardless of inheritance 
D)  The unified constructor always executes first regardless of inheritance

Question 6

Private members of the superclass cannot be accessed by the subclass.

Accepted Answer

A) True 
 B)False

Question 7

If two methods in the same class have the same name but different signatures, the second overrides the first.

Accepted Answer

A) True 
 B)False

Question 8

Replacing inadequate superclass methods with more suitable subclass methods is known as what?

Accepted Answer

A)  Method upgrading 
B)  Tactical inheritance 
C)  Method overriding 
D)  Method overloading 
A)  Method upgrading 
B)  Tactical inheritance 
C)  Method overriding 
D)  Method overloading

Question 9

Protected class members are denoted in a UML diagram with the symbol

Accepted Answer

A)  * 
B)  # 
C)  + 
D)  - 
A)  * 
B)  # 
C)  + 
D)  -

Question 10

Every class is either directly or indirectly derived from the Object class.

Accepted Answer

A) True 
 B)False

Question 11

A subclass can directly access:

Accepted Answer

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

Question 12

This annotation tells the Java compiler that a method is meant to override a method in the superclass.

Accepted Answer

A)  @Override 
B)  @Overload 
C)  @Protected 
D)  @Inherited 
A)  @Override 
B)  @Overload 
C)  @Protected 
D)  @Inherited

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

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

Accepted Answer

A) True 
 B)False

Question 15

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 
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 16

A compiler error will result if an anonymous inner class tries to use a variable that is not final, or not effectively final.

Accepted Answer

A) True 
 B)False

Question 17

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 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, int c){}
Line 11 public double method2(double c){}
Line 12 }

Accepted Answer

A)  10, 4 
B)  11, 5 
C)  Both A and B 
D)  None of the above 
A)  10, 4 
B)  11, 5 
C)  Both A and B 
D)  None of the above

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)  All of the above 
A)  methods of the same class 
B)  methods of a subclass 
C)  methods in the same package 
D)  All of the above

Question 19

Look at the following code and determine what the call to super will do. public class ClassB extends ClassA
{
Public ClassB()
{
Super(10);
}
}

Accepted Answer

A)  This cannot be determined form the code shown. 
B)  It will call the constructor of ClassA that receives an integer as an argument. 
C)  It will call the method named super and pass the value 10 to it as an argument. 
D)  The method super will have to be defined before we can say what will happen. 
A)  This cannot be determined form the code shown. 
B)  It will call the constructor of ClassA that receives an integer as an argument. 
C)  It will call the method named super and pass the value 10 to it as an argument. 
D)  The method super will have to be defined before we can say what will happen.

Question 20

What is wrong with the following code?
Public class ClassB extends ClassA
{
Public ClassB()
{
Int init = 10;
Super(40);
}
}

Accepted Answer

A)  Nothing is wrong with the code. 
B)  The method super is not defined. 
C)  The call to the method super must be the first statement in the constructor. 
D)  No values may be passed to super. 
A)  Nothing is wrong with the code. 
B)  The method super is not defined. 
C)  The call to the method super must be the first statement in the constructor. 
D)  No values may be passed to super.

When one object is a specialized version of another object, there is this type of relationship between them.

In UML diagrams, inheritance is shown:

It is not possible for a superclass to call a subclass's method.

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."); } }

In an inheritance relationship:

Private members of the superclass cannot be accessed by the subclass.

If two methods in the same class have the same name but different signatures, the second overrides the first.

Replacing inadequate superclass methods with more suitable subclass methods is known as what?

Protected class members are denoted in a UML diagram with the symbol

Every class is either directly or indirectly derived from the Object class.

A subclass can directly access:

This annotation tells the Java compiler that a method is meant to override a method in the superclass.

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

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

When a subclass overloads a superclass method:

A compiler error will result if an anonymous inner class tries to use a variable that is not final, or not effectively final.

A protected member of a class may be directly accessed by:

Look at the following code and determine what the call to super will do. public class ClassB extends ClassA { Public ClassB() { Super(10); } }

What is wrong with the following code? Public class ClassB extends ClassA { Public ClassB() { Int init = 10; Super(40); } }

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 one object is a specialized version of another object, there is this type of relationship between them.

In UML diagrams, inheritance is shown:

It is not possible for a superclass to call a subclass's method.

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."); } }

In an inheritance relationship:

Private members of the superclass cannot be accessed by the subclass.

If two methods in the same class have the same name but different signatures, the second overrides the first.

Replacing inadequate superclass methods with more suitable subclass methods is known as what?

Protected class members are denoted in a UML diagram with the symbol

Every class is either directly or indirectly derived from the Object class.

A subclass can directly access:

This annotation tells the Java compiler that a method is meant to override a method in the superclass.

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

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

When a subclass overloads a superclass method:

A compiler error will result if an anonymous inner class tries to use a variable that is not final, or not effectively final.

A protected member of a class may be directly accessed by:

Look at the following code and determine what the call to super will do. public class ClassB extends ClassA { Public ClassB() { Super(10); } }

What is wrong with the following code? Public class ClassB extends ClassA { Public ClassB() { Int init = 10; Super(40); } }

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