Deck 2: Using Data

Question 1

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

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

Answer 1

D

Question 2

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

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

Answer 2

B

Question 3

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

Answer 3

False

Question 4

Once a variable has been declared and initialized, new values may not be assigned to the variable.

Question 5

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

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

Question 6

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

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

Question 7

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

Question 8

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

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

You can create a confirm dialog box with five arguments.

Question 11

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

Question 12

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

Question 13

The term parse means to break into component parts.

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

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

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

Question 17

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

Question 18

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 19

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

Question 20

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

Question 21

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 22

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

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

Question 23

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 24

When you write programs that accept ____________________, there is a risk that the user will enter the wrong type of data.

Question 25

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

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

Question 26

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

Question 27

____ occurs when both of the operands are integers.

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

Question 28

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

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

Question 29

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 30

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

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

Question 31

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

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

Question 32

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 33

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 34

The percent sign is the ____ operator.

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

Question 35

A(n) ____________________ is a simple data type.

Question 36

A(n) ____________________ number contains decimal positions.

Question 37

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

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

Question 38

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 39

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 40

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

Question 42

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 43

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

Question 44

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 45

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

Question 46

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

Question 47

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

Question 48

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

Question 49

Describe and give an example of operator precedence.

Question 50

How could you alter the following statement to display "Welcome" on one line and "back" on another line? Show two possible solutions.
System.out.println("Welcome back");

Question 51

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 52

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

Question 53

char aCharacter = 2;
int aNumber = '2';
In the above statements, what values will be output after a println() statement is executed? Why are the output results different for the two statements?

Question 54

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

Question 55

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

Question 56

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

Question 57

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 58

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

Question 59

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

Question 60

Why is the following relational operator expression invalid? How could you rewrite the statement so that it is valid?
boolean isGradePassing = (grade => 70);

Question 61

public class YourGrade
{
    public static void main(String[] args)
    {
  int projectPoints = 89;
  System.out.print("Your grade for this class is ");
  System.out.print(projectPoints);
  System.out.println("%");
     }
}
Given the above code, what will be the output at the command prompt?

Question 62

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 63

Describe the error message that will be produced when the following code is compiled.
public class SalesOct
{
    public static void main(String[] args)
    {
int salesAmt;
System.out.print("October sales are $");
System.out.println(salesAmt);
     }
}

Question 64

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 65

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

Question 66

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

Question 67

public class EndValue
{
    public static void main(String[] args)
    {
int aByte = 940;
   System.out.print("The ending value is "+ aByte);
    }
}
When the above code is compiled, what error message will be generated and why?