Deck 2: Java Fundamentals

Question 1

What would be displayed as a result of 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.

Answer 1

B

Question 2

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.

Answer 2

A

Question 3

This is a value that is written into the code of a program.

A) Literal
B) Assignment statement
C) Operator
D) Variable

Answer 3

A

Question 4

Which of the following is not a valid Java comment?

A) /** Comment 1 */
B) */ Comment 2 /*
C) // Comment 3
D) /* Comment 4 */

Question 5

To print "Hello, world" on the monitor, use the following Java statement:

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

Question 6

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 = y;
C) x = (float)y;
D) x = y;

Question 7

A Java program must have at least one

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

Question 8

Variables are classified according to their

A) names.
B) values.
C) location in memory.
D) data type.

Question 9

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 10

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

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

Question 11

What will be the displayed when the following code is executed?
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 12

This is a named storage location in the computer's memory.

A) Operator
B) Constant
C) Literal
D) Variable

Question 13

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

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

Question 14

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 15

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 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 16

What will be 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 17

When saving a Java source file, save it with an extension of

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

Question 18

The boolean data type may contain 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 19

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 20

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 21

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

Question 22

Which Scanner class method reads a String?

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

Question 23

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

Question 24

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

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

Question 25

If you wish 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 26

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

Question 27

What will be displayed after the following statements have been executed?
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 28

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

Question 29

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

Question 30

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 31

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 32

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

Question 33

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

Question 34

The ________ method is used to display a message dialog.

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

Question 35

This 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

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 37

What will be the value of z as a result of executing the following code?
Int x = 5, y = 28;
Float z;
Z = (float) (y / x);

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

Question 38

Programming style includes techniques for consistently putting spaces and indentation in a program so visual cues are created.

Question 39

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

Question 40

The simplest way you can 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.