Question 1

What is the toString() method used for and how is it used?

Accepted Answer

The Object class toString() method converts an Object into a String that contains information about the Object . If you do not create a toString() method that overrides the version in the Object class, you can use the superclass version of the method.

Question 2

A(n) ____ is not an object, but it points to a memory address.

Accepted Answer

A)  abstract class 
B)  reference 
C)  extend 
D)  interface 
A)  abstract class 
B)  reference 
C)  extend 
D)  interface B

Question 3

In other programming languages, such as C++, abstract classes are known as ____ classes.

Accepted Answer

A)  anonymous 
B)  pseudo 
C)  simulated 
D)  virtual 
A)  anonymous 
B)  pseudo 
C)  simulated 
D)  virtual D

Question 4

Which of the following statements creates an array of three Animal references?

Accepted Answer

A)  Animal[] ref = new Animal(3); 
B)  Animal[] new = ref Animal[3]; 
C)  Animal[] animalRef = new Animal[3]; 
D)  Animal[] ref = extend Animal[3]; 
A)  Animal[] ref = new Animal(3); 
B)  Animal[] new = ref Animal[3]; 
C)  Animal[] animalRef = new Animal[3]; 
D)  Animal[] ref = extend Animal[3];

Question 5

When you create a superclass and one or more subclasses, each object of each subclass is a subclass object.

Accepted Answer

A) True 
 B)False

Question 6

Match between columns
                        Premises: Prohibited in Java

Accepted Answer

The Answer of JAR file and anonymous inner class and is...

Question 7

A class that will be placed in a nondefault package for others to use must be private .

Accepted Answer

A) True 
 B)False

Question 8

When a class both extends and implements , by convention the ____ clause follows the keyword  extends  in the class header.

Accepted Answer

A)  extends 
B)  new 
C)  implements 
D)  if 
A)  extends 
B)  new 
C)  implements 
D)  if

Question 9

If you create an empty method within an abstract class, the method is abstract even if you do not explicitly use the keyword abstract.

Accepted Answer

A) True 
 B)False

Question 10

When you create a new subclass in Java, neither the superclass source code nor the superclass ____ is changed.

Accepted Answer

A)  bytecode 
B)  object 
C)  argument 
D)  possession 
A)  bytecode 
B)  object 
C)  argument 
D)  possession

Question 11

Match between columns
                        Premises: The name given to abstract classes in other programming languages, such as C++

Accepted Answer

The Answer of hash code and lambda expression and virtual is...

Question 12

A(n) ____ class is a class that you create only to extend from.

Accepted Answer

A)  abstract 
B)  inheritance 
C)  parent 
D)  final 
A)  abstract 
B)  inheritance 
C)  parent 
D)  final

Question 13

In the Java programming language, a package or class library is often delivered to users as a(n) ____ file.

Accepted Answer

A)  JAR 
B)  interface 
C)  .java 
D)  class 
A)  JAR 
B)  interface 
C)  .java 
D)  class

Question 14

When you show abstract classes and methods in class diagrams, their names appear in ____.

Accepted Answer

A)  bold 
B)  all caps 
C)  italics 
D)  blue 
A)  bold 
B)  all caps 
C)  italics 
D)  blue

Question 15

When you create a class and use the implements clause to implement an interface but fail to code one of the interface's methods, the compiler error generated indicates that you must declare your class to be ____.

Accepted Answer

A)  abstract 
B)  static 
C)  public 
D)    new 
A)  abstract 
B)  static 
C)  public 
D)    new

Question 16

If you do not specify a package for a class, it is placed in an unnamed ____ package.

Accepted Answer

A)  system 
B)  language 
C)  default 
D)  general 
A)  system 
B)  language 
C)  default 
D)  general

Question 17

____ is a calculated number that is used to uniquely identify an object.

Accepted Answer

A)  Method binding 
B)  A hash code 
C)  Implicit conversion 
D)  Ad-hoc polymorphism 
A)  Method binding 
B)  A hash code 
C)  Implicit conversion 
D)  Ad-hoc polymorphism

Question 18

The shaded header of the talkingAnimal() method accepts any type of Animal argument. Explain how this is possible.

Accepted Answer

Dynamic method binding is most useful wh

Question 19

Match between columns
                        Premises: Allows object instantiation

Accepted Answer

The Answer of lambda expression and nonabstract method and concrete is...

Question 20

Match between columns
                        Premises: Considers two objects of the same class to be equal only if they have the same hash code

Accepted Answer

The Answer of java.lang and virtual classes and dynamic method is...

What is the toString() method used for and how is it used?

A(n) ____ is not an object, but it points to a memory address.

In other programming languages, such as C++, abstract classes are known as ____ classes.

Which of the following statements creates an array of three Animal references?

When you create a superclass and one or more subclasses, each object of each subclass is a subclass object.

A class that will be placed in a nondefault package for others to use must be private .

When a class both extends and implements , by convention the ____ clause follows the keyword extends in the class header.

If you create an empty method within an abstract class, the method is abstract even if you do not explicitly use the keyword abstract.

When you create a new subclass in Java, neither the superclass source code nor the superclass ____ is changed.

A(n) ____ class is a class that you create only to extend from.

In the Java programming language, a package or class library is often delivered to users as a(n) ____ file.

When you show abstract classes and methods in class diagrams, their names appear in ____.

When you create a class and use the implements clause to implement an interface but fail to code one of the interface's methods, the compiler error generated indicates that you must declare your class to be ____.

If you do not specify a package for a class, it is placed in an unnamed ____ package.

____ is a calculated number that is used to uniquely identify an object.

The shaded header of the talkingAnimal() method accepts any type of Animal argument. Explain how this is possible.

Creating Your First Java Classes

Using Data

Using Methods, Classes and Objects

More Object Concepts

Making Decisions

Looping

Characters, Strings and the Stringbuilder

Arrays

Advanced Array Concepts

Introduction to Inheritance

Exception Handling

File Input and Output

Introduction to Swing Components

Using Javafx and Scene Builder

Filters

Exam 11: Advanced Inheritance Concepts

What is the toString() method used for and how is it used?

A(n) ____ is not an object, but it points to a memory address.

In other programming languages, such as C++, abstract classes are known as ____ classes.

Which of the following statements creates an array of three Animal references?

When you create a superclass and one or more subclasses, each object of each subclass is a subclass object.

A class that will be placed in a nondefault package for others to use must be private .

When a class both extends and implements , by convention the ____ clause follows the keyword extends in the class header.

If you create an empty method within an abstract class, the method is abstract even if you do not explicitly use the keyword abstract.

When you create a new subclass in Java, neither the superclass source code nor the superclass ____ is changed.

A(n) ____ class is a class that you create only to extend from.

In the Java programming language, a package or class library is often delivered to users as a(n) ____ file.

When you show abstract classes and methods in class diagrams, their names appear in ____.

When you create a class and use the implements clause to implement an interface but fail to code one of the interface's methods, the compiler error generated indicates that you must declare your class to be ____.

If you do not specify a package for a class, it is placed in an unnamed ____ package.

____ is a calculated number that is used to uniquely identify an object.

The shaded header of the talkingAnimal() method accepts any type of Animal argument. Explain how this is possible.

Creating Your First Java Classes

Using Data

Using Methods, Classes and Objects

More Object Concepts

Making Decisions

Looping

Characters, Strings and the Stringbuilder

Arrays

Advanced Array Concepts

Introduction to Inheritance

Exception Handling

File Input and Output

Introduction to Swing Components

Using Javafx and Scene Builder

Filters