Deck 2: Java Fundamentals

Question 1

Both character and string literals can be assigned to a char variable.

Answer 1

False

Question 2

Which of the following is a value that is written into the code of a program?

A) a literal
B) an assignment statement
C) an operator
D) a variable

Answer 2

A

Question 3

Which of the following is a named storage location in the computer's memory?

A) a literal
B) an operator
C) a constant
D) a variable

Answer 3

D

Question 4

Character literals are enclosed in __________ and string literals are enclosed in __________.

A) single quotes, double quotes
B) double quotes, single quotes
C) single quotes, single quotes
D) double quotes, double quotes

Question 5

When you call one of the Scanner class's methods to read a primitive value, such as nextInt or nextDouble , and then call the nextLine method to read a string, an annoying and hard-to-find problem can occur.

Question 6

What is the result of the following expression?
10 + 5 * 3 - 20

A) -5
B) -50
C) 5
D) 25

Question 7

In the following Java statement, what value is stored in the variable name?
String name = "John Doe";

A) "name"
B) the memory address where "John Doe" is located
C) the memory address where name is located
D) John Doe

Question 8

The System.out.printf method allows you to format output in a variety of ways.

Question 9

The Java API provides a class named Math that contains numerous methods which are useful for performing complex mathematical operations.

Question 10

Unlike a console program, a program that uses the JOptionPane does not automatically stop executing when the end of the main method is reached.

Question 11

Which of the following is not a rule that must be followed when naming identifiers?

A) After the first character, you may use the letters a-z, A-Z, an underscore, a dollar sign, or the digits 0-9.
B) Identifiers can contain spaces.
C) Uppercase and lowercase characters are distinct.
D) The first character must be one of the letters a-z, A-Z, an underscore, or a dollar sign.

Question 12

Programming style includes techniques for consistently putting spaces and indentation in a program to help create visual cues.

Question 13

Which of the following is not a valid Java comment?

A) /** Comment one */
B) */ Comment two /*
C) // Comment three
D) /* Comment four */

Question 14

Variables are classified according to their

A) names
B) values
C) locations
D) data types

Question 15

What is the result of the following expression?
17 % 3 * 2 - 12 + 15

A) 105
B) 12
C) 7
D) 8

Question 16

Named constants are initialized with a value and that value cannot change during the execution of the program.

Question 17

If you use a flag in a format specifier, you must write the flag before the field width and the precision.

Question 18

A Java source file must be saved with the extension

A) .java
B) .javac
C) .src
D) .class

Question 19

A message dialog is a quick and simple way to ask the user to enter data.

Question 20

A variable's scope is the part of the program that has access to that variable.

Question 21

What would be displayed as a result of executing the following code?
int x = 578;
System.out.print("There are " +
X + 5 + "\n" +
"hens in the hen house.");

A) There are 583
Hens in the hen house.
B) There are 5785
Hens in the hen house.
C) There are x5\nhens in the hen house.
D) There are 5785 hens in the hen house.

Question 22

The boolean data type may contain which of the following range of values?

A) -128 to + 127
B) true or false
C) -2,147,483,648 to +2,147,483,647
D) -32,768 to +32,767

Question 23

The __________ method is used to display a message dialog.

A) showMessageDialog
B) messageDialog
C) messageDialogShow
D) showDialog

Question 24

Variables of the boolean data type are useful for

A) evaluating conditions that are either true or false
B) working with small integers
C) working with very large integers
D) evaluating scientific notation

Question 25

What is the value of z after the following code is executed?
int x = 5, y = 28;
Float z;
Z = (float) (y / x);

A) 5.6
B) 3.0
C) 5.0
D) 5.60

Question 26

If you want to use the System.out.printf method to print a string argument , use the __________ format specifier.

A) % d
B) %b
C) %f
D) % s

Question 27

Which of the following statements correctly creates a Scanner object for keyboard input?

A) Scanner kbd = new Scanner(System.keyboard);
B) Scanner keyboard = new Scanner(System.in);
C) Scanner keyboard(System.in);
D) Keyboard scanner = new Keyboard(System.in);

Question 28

What would be displayed as a result of executing the following code?
int x = 15, y = 20, z = 32;
X += 12;
Y /= 6;
Z -= 14;
System.out.println("x = " + x +
", y = " + y +
", z = " + z);

A) x = 27, y = 3.333, z = 18
B) x = 27, y = 2, z = 18
C) x = 37, y = -14, z = 4
D) x = 27, y = 3, z = 18

Question 29

The simplest way to use the System.out.printf method is

A) with a format string and one format specifier
B) with only a format string and no additional arguments
C) with a format string and one or more format specifiers
D) with only one format specifier and no format string

Question 30

A Java program must have at least one of the following:

A) a comment
B) a class definition
C) a System.out.println(); statement
D) a variable declaration

Question 31

What output will be displayed as a result of executing the following code?
int x = 5, y = 20;
X += 32;
Y /= 4;
System.out.println("x = " + x + ", y = " + y);

A) x = 160, y = 80
B) x = 32, y = 4
C) x = 37, y = 5
D) x = 9, y = 52

Question 32

What would be displayed as a result of executing the following code?
final int x = 22, y = 4;
Y += x;
System.out.println("x = " + x + ", y = " + y)

A) x = 22, y = 26
B) x = 22, y = 4
C) x = 22, y = 88
D) Nothing. There is an error in the code.

Question 33

A(n) __________ is a dialog box that prompts the user for input.

A) input box
B) user prompt
C) adaptive dialog
D) input dialog

Question 34

What is the value of z after the following statements have been executed?
int x = 4, y = 33;
Double z;
Z = (double) (y / x);

A) 8.25
B) 4
C) 0
D) 8.0

Question 35

Which statement tells the compiler where to find the JOptionPane class and makes it available to your program?

A) import javax.swing.JOptionPane;
B) import Java.Swing.JOptionPane;
C) import JOptionPane;
D) import javax.JOptionPane;

Question 36

Which of the following statements will correctly convert the data type, if x is a float and y is a double?

A) x = float y;
B) x = <float>y;
C) x = (float)y;
D) x = y;

Question 37

To print "Hello, world" on the monitor, which of the following Java statements should be used?

A) System.out.println("Hello, world");
B) System Print = "Hello, world";
C) SystemOutPrintln('Hello, world');
D) system.out.println(Hello, world);

Question 38

The primitive data types only allow a(n) __________ to hold a single value.

A) class
B) literal
C) object
D) variable

Question 39

Which of the following statements is invalid?

A) double r = 9.4632E15;
B) double r = 9.4632e15;
C) double r = 2.9X106;
D) double r = 326.75;

Question 40

Which Scanner class method reads a String?

A) nextLine
B) charAt
C) nextString
D) getLine