Deck 1: Creating Your First Java Classes

Question 1

Given the statement:   System.out.println("First Java application"); out refers to ____.

A) the screen
B) the standard output device
C) the printer
D) the keyboard

Answer 1

B

Question 2

Locating and repairing all syntax errors is part of the process of ____ a program.

A) interpreting
B) compiling
C) debugging
D) executing

Answer 2

C

Question 3

____ are pieces of information that are sent into, or passed to, a method, usually because the method requires the information to perform its task or carry out its purpose.

A) Applets
B) Methods
C) Arguments
D) Objects

Answer 3

C

Question 4

In Java, the reserved keyword ____ means that a method is accessible and usable even though no objects of the class exist.

A) active
B) undefined
C) static
D) void

Question 5

When you issue the command to compile a class containing errors, the Java compiler does not produce any error messages. You will first need to run the class in order to see error messages.

Question 6

A Java identifier can contain only letters, digits, ampersands, or number signs.

Question 7

Dots (or periods) in a Java statement are used to separate the names of the components that make up the statement.

Question 8

If an object's methods are well written, the user is unaware of the low-level details of how the methods are executed, and the user must simply understand the interface or interaction between the method and the object.

Question 9

System software is used for tasks such as word processing, calculations and playing games.

Question 10

A(n) ____ defines the circumstances under which a class can be accessed and the other classes that have the right to use a class.

A) identifier
B) access specifier
C) parameter
D) Pascal casing

Question 11

Using the void keyword in the main() method header indicates that a value will be returned by the main() method is called.

Question 12

A compiler ignores whitespace (that is, any combination of nonprinting characters) between words and lines.

Question 13

Although not a requirement, it is Java standard that class identifiers begin with an uppercase letter and use other uppercase letters to improve readability.

Question 14

____ describes the feature of languages that allows the same word to be interpreted correctly in different situations based on the context.

A) Polymorphism
B) Architecturally neutral
C) Source code
D) Insulation

Question 15

You must use the Java interpreter to translate the bytecode into executable statements before running a Java application.

Question 16

____ refers to the hiding of data and methods within an object.

A) Instance
B) Inheritance
C) Passed
D) Encapsulation

Question 17

A program written in ____ is the most basic circuitry-level language.

A) Java
B) machine language
C) BASIC
D) C

Question 18

Logic errors are easily identified when a program is compiled.

Question 19

Line comments start with ____.

A) a forward slash and an asterisk
B) two forward slashes
C) a forward slash and two asterisks
D) a percent sign

Question 20

____ are also called modules, methods, functions, and subroutines. Java programmers most frequently use the term "method."

A) Procedures
B) Calls
C) Classes
D) Applications

Question 21

After a successful compile, you can run the class file on any computer that has a ____.

A) Java language interpreter
B) Web browser
C) text editor
D) DOS

Question 22

You use an  import  statement when you want to access a built-in Java class that is contained in a group of classes called a(n) ____.

A) JGroup
B) JImport
C) package
D) GUI

Question 23

A ____ is an error not detected until the program asks the computer to do something wrong, or even illegal, while executing.

A) syntax error
B) run-time error
C) package
D) Java API

Question 24

In programming, named computer memory locations are called ____because they hold values that might vary.

A) constants
B) variables
C) strings
D) addresses

Question 25

Whenever a method requires multiple arguments, the arguments are always separated with ____.

A) commas
B) periods
C) forward slashes
D) brackets

Question 26

In a ____ environment, you can change directories using the cd command. For example, to change to a directory named MyClasses , you type cd MyClasses and press Enter.

A) Windows
B) Java
C) graphical
D) DOS

Question 27

   public class First    {
     public static void main(String[] args)
     {
        System.out.println("First Java application");
     }
   }
Given the above code, which item identifies the method's return type?

A) public
B) static
C) void
D) println

Question 28

____ is the process the compiler uses to divide your source code into meaningful portions; the message means that the compiler was in the process of analyzing the code when the end of the file was encountered prematurely.

A) Running
B) Debugging
C) Compiling
D) Parsing

Question 29

If you receive an error that states, "Exception in thread 'main' java.lang.NoClassDefFoundError," when you try to execute the application, you probably do not have your ____ set correctly.

A) class length
B) class path
C) java
D) object

Question 30

Java contains a class named ____ that allows you to produce dialog boxes.

A) JBox
B) JOptionPane
C) JDialog
D) JGUI

Question 31

public class First {
   public static void main(String[] args)
   {
      System.out.println("First Java application");
   }
}
Given the above code, which item identifies the name of the class?

A) public
B) static
C) void
D) First

Question 32

   public class First    {
     public static void main(String[] args)
     {
        System.out.println("First Java application");
     }
   }
Given the above code, which item identifies that the method will work without instantiating an object of the class?

A) public
B) static
C) void
D) println

Question 33

A(n) ____ error occurs when the syntax of the program is correct and the program compiles but produces incorrect results when you execute it.

A) logic
B) syntax
C) JVM
D) class

Question 34

____ comments are a special case of block comments that are used to generate documentation.

A) Line comments
B) Doc comments
C) JDoc
D) Javadoc

Question 35

It is a tradition among programmers that the first program you write in any language produces "____" as its output.

A) Hi, your name!
B) Hello, world!
C) My first program!
D) Hello, your name!

Question 36

{ public static void main(String[] args)
   {
      System.out.println("First Java application");
   }
}
Given the above code, which item identifies the access specifier?

A) public
B) static
C) void
D) First

Question 37

If a compiler detects a violation of language rules, it refuses to translate the class to ____.

A) an application
B) a logic error
C) machine code
D) Java

Question 38

When you run a Java application using the ____ command, do not add the .class extension to the filename.

A) class
B) static
C) java
D) output

Question 39

It is best to use the ____ available text editor when writing Java programs.

A) most complex
B) simplest
C) best
D) latest

Question 40

The ____ is also called the Java class library; it contains information about how to use every prewritten Java class, including lists of all the methods you can use with the classes.

A) Java package
B) Java Interface
C) Java SDK
D) Java API

Question 48

A class named  first  is different from a class named  FIRST because ____.

A) Java is case insensitive
B) it is confusing to have two names that look the same
C) Java is case sensitive
D) first and FIRST are different literal strings

Question 51

A(n) ____ is a GUI object resembling a window in which you can place messages you want to display.

A) JDK
B) dialog box
C) variable
D) argument

Question 53

Using the given code, which statement in the  main()  method body will produce the output "Hello to all!". public class Hello
{
   public static void main(String[] args)
   {
       ____
   }
{

A) System.out("Hello to all!");
B) System.println("Hello to all!");
C) println("Hello to all!");
D) System.out.println("Hello to all!");

Question 54

Programmers use ____ to organize program code and make it easier to read.

A) literal strings
B) whitespace
C) headings
D) FAQs

Question 59

What is the purpose of the argument "null" in the statement below: JOptionPane.showMessageDialog(null, "Show my message");

A) This argument is ignored by Java.
B) The output message will be placed in the upper left corner of the screen.
C) The output message will be placed in the middle of the screen.
D) It instructs Java to display the message immediately.

Question 61

Regarding code layout, write the following Java code using a common alternate placement of the first curly brace:
public static void main(String[] args)
{
System.out.println("First Java application");
}

Question 62

Once an application is written and saved, the Java class must be compiled. Describe what two procedures must occur in order to view the output of the application.

Question 63

Why is creating a GUI environment for users a natural use for object orientation?

Question 64

Explain the purpose of arguments and why it is necessary to pass arguments to a method.

Question 65

When you define a Java class using an identifier, what are the requirements you need to know?

Question 66

public class FindMyErrors
{
   public static void main(String[] args)
   {
       System.out.println("My application with errors)
    }
Given the above code, identify three separate syntax errors.

Question 67

If you modify a class, what are the steps you must take to see your changes in the executing program?

Question 68

What happens after a programmer successfully compiles a Java program named "First.java"?

Question 69

What are the differences between K & R style and Allman style? Which one is used in this textbook?

Question 70

What are some of the reasons the javac command might not be recognized?

Question 71

Write a line comment and block comment for the following line of code identifying the author, date, and purpose of the method. In addition, explain the difference between comments that consist of a double-slash (//) and those that have a starting and ending slash asterisk (/* .. */).
System.out.println("Hello Students");

Question 72

Describe the components (objects and classes) that are used in the statement System.out.println() .

Question 73

Briefly describe the elements of the main() method:
public static void main(String[] args)
{
Java code...
}

Question 74

Provide examples of logic errors. How do programmers minimize logic errors in their code?

Question 75

System.out.println("First Java application");
​ Given the above code, identify and describe the use of a literal string and the use of parentheses.

Question 76

Why is it important for programmers to use program comments?