Question 1

The format specifier ________ is used to output values of type float or double.

Accepted Answer

A)  %f 
B)  %d 
C)  %fd 
D)  %r 
A)  %f 
B)  %d 
C)  %fd 
D)  %r

Question 2

A key part of enabling the JVM to locate and call method main to begin the app's execution is the ________ keyword, which indicates that main can be called without first creating an object of the class in which the method is declared.

Accepted Answer

A)  stable 
B)  private 
C)  static 
D)  public 
A)  stable 
B)  private 
C)  static 
D)  public

Question 3

When a method terminates, the values of its local variables are ________.

Accepted Answer

A)  saved 
B)  copied 
C)  restored 
D)  lost 
A)  saved 
B)  copied 
C)  restored 
D)  lost

Question 4

You can declare new classes as needed; this is one reason Java is known as a(n) ________ language.

Accepted Answer

A)  portable 
B)  incremental 
C)  extensible 
D)  virtual 
A)  portable 
B)  incremental 
C)  extensible 
D)  virtual

Question 5

Which of the following statements is true?

Accepted Answer

A)  The UML models a parameter of an operation by listing the parameter name, followed by a colon and the parameter value between the parentheses after the operation name. 
B)  The UML indicates an operation's return type by placing a colon and the return value after the parentheses following the operation name. 
C)  UML class diagrams do not specify return types for operations that do not return values. 
D)  Declaring instance variables public is known as data hiding or information hiding. 
A)  The UML models a parameter of an operation by listing the parameter name, followed by a colon and the parameter value between the parentheses after the operation name. 
B)  The UML indicates an operation's return type by placing a colon and the return value after the parentheses following the operation name. 
C)  UML class diagrams do not specify return types for operations that do not return values. 
D)  Declaring instance variables public is known as data hiding or information hiding.

Question 6

Each class you create becomes a new ________ that can be used to declare variables and create objects.

Accepted Answer

A)  package 
B)  instance 
C)  library 
D)  type. 
A)  package 
B)  instance 
C)  library 
D)  type.

Question 7

If a class does not define constructors, the compiler provides a default constructor with no parameters, and the class's instance variables are initialized to ________.

Accepted Answer

A)  zero 
B)  null 
C)  their default values. 
D)  false 
A)  zero 
B)  null 
C)  their default values. 
D)  false

Question 8

The format specifier %.2f specifies that two digits of precision should be output ________ in the floating-point number.

Accepted Answer

A)  to the left of the decimal point 
B)  centered 
C)  to the right of the decimal point 
D)  None of the above. 
A)  to the left of the decimal point 
B)  centered 
C)  to the right of the decimal point 
D)  None of the above.

Question 9

A __________ of a class called MyClass is another class whose methods call the methods of MyClass.

Accepted Answer

A)  consumer 
B)  servant 
C)  caller 
D)  client 
A)  consumer 
B)  servant 
C)  caller 
D)  client

Question 10

Which of the following statements is false?

Accepted Answer

A)  A floating-point number is a number with a decimal point. 
B)  Java provides two primitive types for storing floating-point numbers in memory-float and double. 
C)  Variables of type float represent single-precision floating-point numbers and have seven significant digits. 
D)  Variables of type double represent double-precision floating-point numbers; these require twice as much memory as float variables and provide 14 significant digits. 
A)  A floating-point number is a number with a decimal point. 
B)  Java provides two primitive types for storing floating-point numbers in memory-float and double. 
C)  Variables of type float represent single-precision floating-point numbers and have seven significant digits. 
D)  Variables of type double represent double-precision floating-point numbers; these require twice as much memory as float variables and provide 14 significant digits.

Question 11

Which of the following statements is true?

Accepted Answer

A)  Local variables are automatically initialized. 
B)  Every instance variable has a default initial value-a value provided by Java when you do not specify the instance variable's initial value. 
C)  The default value for an instance variable of type String is void. 
D)  The argument types in the method call must be identical to the types of the corresponding parameters in the method's declaration. 
A)  Local variables are automatically initialized. 
B)  Every instance variable has a default initial value-a value provided by Java when you do not specify the instance variable's initial value. 
C)  The default value for an instance variable of type String is void. 
D)  The argument types in the method call must be identical to the types of the corresponding parameters in the method's declaration.

Question 12

Which of the following statements is false?

Accepted Answer

A)  Each class declaration that begins with the access modifier private must be stored in a file that has the same name as the class and ends with the .java filename extension. 
B)  Every class declaration contains keyword class followed immediately by the class's name. 
C)  Class, method and variable names are identifiers. 
D)  An object has attributes that are implemented as instance variables and carried with it throughout its lifetime. 
A)  Each class declaration that begins with the access modifier private must be stored in a file that has the same name as the class and ends with the .java filename extension. 
B)  Every class declaration contains keyword class followed immediately by the class's name. 
C)  Class, method and variable names are identifiers. 
D)  An object has attributes that are implemented as instance variables and carried with it throughout its lifetime.

Exam 3: Introduction to Classes, Objects, Methods and Strings

The format specifier ________ is used to output values of type float or double.

A key part of enabling the JVM to locate and call method main to begin the app's execution is the ________ keyword, which indicates that main can be called without first creating an object of the class in which the method is declared.

When a method terminates, the values of its local variables are ________.

You can declare new classes as needed; this is one reason Java is known as a(n) ________ language.

Which of the following statements is true?

Each class you create becomes a new ________ that can be used to declare variables and create objects.

If a class does not define constructors, the compiler provides a default constructor with no parameters, and the class's instance variables are initialized to ________.

The format specifier %.2f specifies that two digits of precision should be output ________ in the floating-point number.

A __________ of a class called MyClass is another class whose methods call the methods of MyClass.

Which of the following statements is false?

Which of the following statements is true?

Which of the following statements is false?

Introduction to Computers, the Internet and Java

Introduction to Java Applications; Inputoutput and Operators

Control Statements: Assignment, and Operators

Control Statements: Logical Operators

Methods: a Deeper Look

Arrays and Arraylists

Classes and Objects: a Deeper Look

Object-Oriented Programming: Inheritance

Object-Oriented Programming: Polymorphism and Interfaces

Exception Handling: a Deeper Look

Javafx Graphical User Interfaces

Javafx Gui

Strings, Characters and Regular Expressions

Files, Inputoutput Streams, Nio and Xml Serialization

Generic Collections

Lambdas and Streams

Recursion

Searching, Sorting and Big O

Generic Classes and Methods: a Deeper Look

Custom Generic Data Structures

Concurrency

Accessing Databases With Jdbc

Swing Gui Components

Graphics and Java 2d

Networking

Java Persistence Api Jpa

Javaserver Faces Web Apps

Javaserver Faces Web Apps

Swing Gui Components

Filters