Question 1

Like a family tree, a ________ shows the inheritance relationship between classes.

Accepted Answer

A)  flowchart 
B)  class map 
C)  class hierarchy 
D)  binary tree 
A)  flowchart 
B)  class map 
C)  class hierarchy 
D)  binary tree

Question 2

The super statement that calls the superclass constructor:

Accepted Answer

A)  must be the first statement in the superclass's constructor 
B)  can appear in any method of the subclass 
C)  must be the first statement in the subclass's constructor 
D)  is deprecated and is no longer supported in newer versions of Java 
A)  must be the first statement in the superclass's constructor 
B)  can appear in any method of the subclass 
C)  must be the first statement in the subclass's constructor 
D)  is deprecated and is no longer supported in newer versions of Java

Question 3

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

Accepted Answer

A) True 
 B)False

Question 4

Every class has a toString method and an equals method inherited from the Object class.

Accepted Answer

A) True 
 B)False

Question 5

If a class contains an abstract method:

Accepted Answer

A)  you cannot create an instance of the class 
B)  the method will have only a header, but not a body, and end with a semicolon 
C)  the method must be overridden in subclasses 
D)  All of the above 
A)  you cannot create an instance of the class 
B)  the method will have only a header, but not a body, and end with a semicolon 
C)  the method must be overridden in subclasses 
D)  All of the above

Question 6

Protected members are:

Accepted Answer

A)  not quite private 
B)  not quite public 
C)  both A and B 
D)  neither A nor B 
A)  not quite private 
B)  not quite public 
C)  both A and B 
D)  neither A nor B

Question 7

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

Question 8

Which of the following statements correctly specifies three interfaces?

Accepted Answer

A)  public class ClassA implements Interface1, Interface2, Interface3 
B)  public class ClassA implements [Interface1, Interface2, Interface3] 
C)  public class ClassA implements (Interface1, Interface2, Interface3) 
D)  public class ClassA implements Interface1 Interface2 Interface3 
A)  public class ClassA implements Interface1, Interface2, Interface3 
B)  public class ClassA implements [Interface1, Interface2, Interface3] 
C)  public class ClassA implements (Interface1, Interface2, Interface3) 
D)  public class ClassA implements Interface1 Interface2 Interface3

Question 9

Which of the following is an example of a lambda expression?

Accepted Answer

A)  int x = x * factor; 
B)  IntCalculator = new divider(x, 2); 
C)  IntCalculator multiplier = x -> x * factor; 
D)  All of the above 
A)  int x = x * factor; 
B)  IntCalculator = new divider(x, 2); 
C)  IntCalculator multiplier = x -> x * factor; 
D)  All of the above

Question 10

An anonymous inner class must:

Accepted Answer

A)  implement an interface 
B)  extend another class 
C)  either A or B 
D)  both A and B 
A)  implement an interface 
B)  extend another class 
C)  either A or B 
D)  both A and B

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 as a result of the following statements?
ClassB 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

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 int method1(int a){}
Line 5 public final int method2(double 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 
B)  5 
C)  10 
D)  11 
A)  4 
B)  5 
C)  10 
D)  11

Question 13

When an "is a" relationship exists between objects, it means that the specialized object has:

Accepted Answer

A)  some of the characteristics of the general class, but not all, plus additional characteristics 
B)  some of the characteristics of the general object, but not all 
C)  none of the characteristics of the general object 
D)  all the characteristics of the general object, plus additional characteristics 
A)  some of the characteristics of the general class, but not all, plus additional characteristics 
B)  some of the characteristics of the general object, but not all 
C)  none of the characteristics of the general object 
D)  all the characteristics of the general object, plus additional characteristics

Question 14

In the following statement, which is the superclass?
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 15

Which of the following statements declares Salaried as a subclass of PayType?

Accepted Answer

A)  public class Salaried extends PayType 
B)  public class Salaried implements PayType 
C)  public class Salaried derivedFrom(Paytype) 
D)  public class PayType derives Salaried 
A)  public class Salaried extends PayType 
B)  public class Salaried implements PayType 
C)  public class Salaried derivedFrom(Paytype) 
D)  public class PayType derives Salaried

Question 16

If a class contains an abstract method:

Accepted Answer

A)  you must create an instance of the class 
B)  the method will have only a header, but not a body, and end with a semicolon 
C)  the method cannot be overridden in subclasses 
D)  All of the above. 
A)  you must create an instance of the class 
B)  the method will have only a header, but not a body, and end with a semicolon 
C)  the method cannot be overridden in subclasses 
D)  All of the above.

Question 17

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 method1 will be executed when the following statements are executed?
ClassA item1 = new ClassB();
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 18

All fields declared in an interface:

Accepted Answer

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

Question 19

Look at the following code. Which line in ClassA has an error?
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 methodA(double) { }
Line 10 }

Accepted Answer

A)  6 
B)  7 
C)  8 
D)  9 
A)  6 
B)  7 
C)  8 
D)  9

Question 20

What is wrong with the following code?
Public class ClassB extends ClassA
{
Public ClassB()
{
Super(40);
System.out.println("This is the last statement " +
"in the constructor.");
}
}

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.

Like a family tree, a ________ shows the inheritance relationship between classes.

The super statement that calls the superclass constructor:

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

Every class has a toString method and an equals method inherited from the Object class.

If a class contains an abstract method:

Protected members are:

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

Which of the following statements correctly specifies three interfaces?

Which of the following is an example of a lambda expression?

An anonymous inner class must:

When an "is a" relationship exists between objects, it means that the specialized object has:

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

Which of the following statements declares Salaried as a subclass of PayType?

If a class contains an abstract method:

All fields declared in an interface:

What is wrong with the following code? Public class ClassB extends ClassA { Public ClassB() { Super(40); System.out.println("This is the last statement " + "in the constructor."); } }

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

Like a family tree, a ________ shows the inheritance relationship between classes.

The super statement that calls the superclass constructor:

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

Every class has a toString method and an equals method inherited from the Object class.

If a class contains an abstract method:

Protected members are:

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

Which of the following statements correctly specifies three interfaces?

Which of the following is an example of a lambda expression?

An anonymous inner class must:

When an "is a" relationship exists between objects, it means that the specialized object has:

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

Which of the following statements declares Salaried as a subclass of PayType?

If a class contains an abstract method:

All fields declared in an interface:

What is wrong with the following code? Public class ClassB extends ClassA { Public ClassB() { Super(40); System.out.println("This is the last statement " + "in the constructor."); } }

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