Deck 2: Using Data

Question 1

In Java, ____ is a built-in class that provides you with the means for storing and manipulating character strings.

A) Escape
B) Type
C) String
D) Character

Answer 1

C

Question 2

Even if a statement occupies multiple lines, the statement is not complete until the semicolon is reached.

Answer 2

True

Question 3

A variable can hold more than one value at a time.

Answer 3

False

Question 4

You use the ____ data type to hold any single character.

A) single
B) char
C) byte
D) float

Question 5

The term parse means to break into component parts.

Question 6

____ refers to the order in which values are used with operators.

A) Associativity
B) Initialization
C) Declaration
D) Floating

Question 7

The byte and short data types occupy less memory and can hold only smaller values.

Question 8

The term ____ refers to the mathematical accuracy of a value.

A) float data
B) real integers
C) significant digits
D) single-precision floating-point number

Question 9

Primitive types serve as the building blocks for more complex data types, called ____ types.

A) integer
B) literal
C) reference
D) data

Question 10

A data item is ____ when it cannot be changed while a program is running.

A) variable
B) constant
C) primitive
D) literal

Question 11

In Java, you use variables of type ____ to store integers, or whole numbers.

A) num
B) double
C) var
D) int

Question 12

The expression   boolean isTenLarger = (10 < 5) will produce a value of true .

Question 13

You can declare as many variables in a statement as you want, as long as the variables are different data types.

Question 14

A ____ is a named memory location that you can use to store a value.

A) cast
B) variable
C) reference
D) primitive

Question 15

A ____ data type can hold 14 or 15 significant digits of accuracy.

A) double
B) float
C) char
D) boolean

Question 16

You can create a confirm dialog box with five arguments.

Question 17

A(n) ____ variable can hold only one of two values: true or false .

A) integer
B) boolean
C) true
D) comparison

Question 18

You are limited to declaring a maximum of three variables in a single statement.

Question 19

Multiplication, division, and remainder always take place after addition or subtraction in an expression.

Question 20

The int data type is the most commonly used integer type.

Question 21

Each primitive type in Java has a corresponding class contained in the java.lang package. These classes are called ____ classes.

A) case
B) primitive
C) type-wrapper
D) show

Question 22

The ____ is the type to which all operands in an expression are converted so that they are compatible with each other.

A) unifying type
B) data type
C) numbered
D) primitive

Question 23

A(n) ____ number contains decimal positions.

A) char
B) int
C) float
D) boolean

Question 24

A(n) ____ dialog box typically displays the options Yes, No, and Cancel.

A) confirm
B) input
C) message
D) answer

Question 25

When a numeric variable is concatenated to a String , the entire expression becomes a(n) ____ .

A) int
B) constant
C) method
D) String

Question 26

You use ____ operators to perform calculations with values in your programs.

A) calculation
B) arithmetic
C) integer
D) precedence

Question 27

The characters ____ move the cursor to the next line when used within a println() statement.

A) /n
B) \n
C) .+
D) $

Question 28

Which line of code correctly creates a Scanner object?

A) Scanner inputDevice = new Scanner(System);
B) Scanner inputDevice = new Scanner(System.in)
C) Scanner inputDevice = new Scanner(in);
D) Scanner inputDevice = new Scanner(System.in);

Question 29

____ occurs when both of the operands are integers.

A) Data modeling
B) Type cast
C) Integer division
D) Unlike assignment

Question 30

A(n)____ operator compares two items and the result has a Boolean value.

A) complex
B) relational
C) unary
D) remainder

Question 31

The percent sign is the ____ operator.

A) remainder
B) remaining
C) percentage
D) integer division

Question 32

You may declare an unlimited number of variables in a statement as long as the variables are ____.

A) the same data type
B) initialized to the same value
C) properly commented
D) floating point numbers

Question 33

You can store any character, including nonprinting characters such as a backspace or a tab, in a(n) ____ variable.

A) int
B) char
C) boolean
D) set

Question 34

Which of the following is NOT a component of a variable declaration statement?

A) data type identifier
B) ending colon
C) variable name
D) ending semicolon

Question 35

A(n) ____ dialog box asks a question and provides a text field in which the user can enter a response.

A) question
B) JOptPane
C) confirm
D) input

Question 36

What is the value of result after the following statement is executed? int result = 2 + 3 * 4;

A) 9
B) 10
C) 14
D) 20

Question 37

In Java, when a numeric variable is concatenated to a String using the ____, the entire expression becomes a String .

A) plus sign
B) equal sign
C) concatenate statement
D) string statement

Question 38

____ forces a value of one data type to be used as a value of another type.

A) Type casting
B) Lossless conversion
C) A type-wrapper class
D) Parsing

Question 39

Which escape sequence will move the cursor to the beginning of the current line?

A) \b
B) \r
C) \\
D) \n

Question 40

A(n) ____ is a simple data type.

A) reference type
B) lvalue
C) primitive type
D) unifying type

Question 45

A data item's ____ is the area in which it is visible to a program and in which you can refer to it using its simple identifier.

A) data type
B) token
C) case
D) scope

Question 46

The Scanner class contains methods that retrieve values called ____.

A) prompts
B) whitespace
C) finals
D) tokens

Question 52

Which statement declares a constant named SALESAMT with a value of 20.99?

A) double SALESAMT = 20.99;
B) final SALESAMT = 20.99;
C) final double SALESAMT = 20.99;
D) final double SALESAMT (20.99);

Question 54

The cast operator is a ____ operator.

A) unary
B) binary
C) ternary
D) boolean

Question 56

A dialog box that displays the options Yes, No, and Cancel can be created using the ____ method in the JOptionPane class.

A) showDialog()
B) showConfirmDialog()
C) JOptionDialog()
D) ConfirmDialog()

Question 61

Describe how the use of named constants can provide advantages over the use of literal values.

Question 62

A variable declaration is a statement that reserves a named memory location. It includes what four elements?

Question 63

import javax.swing.JOptionPane;
public class salesJune
{
    public static void main(String[] args)
    {
       int storeSales = 250;
    }
}
In the above code, complete the statement that will display a message dialog box that will appear centered on the screen and will display the following text:
Congratulations! June sales were $250!

Question 64

Describe and give an example of operator precedence.

Question 65

Write the statement that will declare a char data type named testScore that will hold a letter grade of your choice.

Question 66

final int COSTPERITEM = 10;
double sales2012 = amtSold * COSTPERITEM;
In the above statements, identify the named constant and describe how a programmer can recognize named constants.

Question 67

What is an escape sequence and why would a Java programmer use it to store a character?

Question 68

What is the difference between the float data type and the double data type?

Question 69

Describe how the Scanner class works with the System.in object in order to provide flexibility. Provide an example of using the Scanner class with System.in.

Question 70

Describe three ways in which a named constant differs from a variable.

Question 71

How would you ask the user to confirm an action using a dialog box?

Question 72

Write the statement to declare an uninitialized integer value for salesAmt . Then write the statement to declare a constant named SALESAMT with a value of 20.99.

Question 73

Write the statement that will declare and assign two integer variables, salesAmt and costAmt , in a single statement. Assign values of your choice to the variables.

Question 74

Describe how to use the boolean data type. Show two examples of a boolean variable assignment; one that uses true or false and one that uses a relational operator.

Question 75

How can you create and use an input dialog box in Java?

Question 76

Explain how you can override a unifying type imposed by Java. Show an example.

Question 77

Define an integer and then list and describe the four integer data data types.

Question 78

In Java, how is it possible to perform mathematical operations on operands with unlike types?

Question 79

Describe why it is important to assign an appropriate data type to variables in an application.

Question 80

100 = salesAmount;
In terms of assignment operators, why is the above statement illegal?