Deck 2: Java Fundamentals

Question 1

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

Answer 1

C

Question 2

In Java, ___________ must be declared before they can be used.

A) Variables
B) Literals
C) Key words
D) Comments

Answer 2

A

Question 3

To compile a program named First, use the following command:

A) java First.java
B) javac First
C) javac First.java
D) compile First.javac

Answer 3

C

Question 4

In Java, the beginning of a comment is marked with:

A) //
B) ""
C) ;
D) #

Question 5

What would be printed out as a result of the following code? System.out.println("The quick brown fox" +
"jumped over the \n"
"slow moving hen.");

A) The quick brown fox jumped over the \nslow moving hen.
B) The quick brown fox jumped over the
Slow moving hen.
C) The quick brown fox
Jumped over the
Slow moving hen.
D) Nothing. This is an error.

Question 6

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

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

Question 7

Which of the following cannot be used as identifiers in Java?

A) Variable names
B) Class names
C) Key words
D) All of the above
E) None of the above

Question 8

What is the result of the following expression? 25 / 4 + 4 * 10 % 3

A) 19
B) 5.25
C) 3
D) 7

Question 9

When the + operator is used with strings, it is known as the:

A) Assignment operator
B) String concatenation operator
C) Addition operator
D) Combined assignment operator

Question 10

The term ___________ typically refers to the device that displays console output.

A) Standard output device
B) Central processing unit
C) Secondary storage device
D) Liquid crystal display

Question 11

Which of the following is valid?

A) float y;
Y = 54.9;
B) float y;
Double z;
Z = 934.21;
Y = z;
C) float w;
W = 1.0f;
D) float v;
V = 1.0;

Question 12

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

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

Question 13

The boolean data type may contain values in the following range of values

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

Question 14

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

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

Question 15

Character literals are enclosed in _____; string literals are enclosed in _____.

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

Question 16

Which one of the following would contain the translated Java byte code for a program named Demo?

A) Demo.java
B) Demo.code
C) Demo.class
D) Demo.byte

Question 17

A Java program must have at least one of these:

A) Class definition
B) Variable
C) Comment
D) System.out.println(); statement

Question 18

In Java, it is standard practice to capitalize the first letter of:

A) Class names
B) Variable names
C) Key words
D) Literals

Question 19

If the following Java statements are executed, what will be displayed? System.out.println("The top three winners are\n");
System.out.print("Jody, the Giant\n");
System.out.print("Buffy, the Barbarian");
System.out.println("Adelle, the Alligator");

A) The top three winners are
Jody, the Giant
Buffy, the Barbarian
Adelle, the Alligator
B) The top three winners are
Jody, the Giant\nBuffy, the BarbarianAdelle, the Alligator
C) The top three winners are Jody, the Giant\nBuffy, the BarbarianAdelle, and the Albino
D) The top three winners are
Jody, the Giant
Buffy, the BarbarianAdelle, the Alligator

Question 20

Which of the following is not a primitive data type?

A) short
B) long
C) float
D) String

Question 21

Every Java application program must have

A) a class named MAIN
B) a method named main
C) comments
D) integer variables

Question 22

What will be displayed as a result of executing the following code? int x = 6;
String msg = "I am enjoying this class.";
String msg1 = msg.toUpperCase();
String msg2 = msg.toLowerCase();
Char ltr = msg.charAt(x);
Int strSize = msg.length();
System.out.println(msg);
System.out.println(msg1);
System.out.println(msg2);
System.out.println("Character at index x = " +
Ltr);
System.out.println("msg has " + strSize +
"characters.");

A) I am enjoying this class.
I AM ENJOYING THIS CLASS.
I am enjoying this class.
Character at index x = e
Msg has 24 characters.
B) I am enjoying this class.
I AM ENJOYING THIS CLASS.
I am enjoying this class.
Character at index x = e
Msg has 25 characters.
C) I am enjoying this class.
I AM ENJOYING THIS CLASS.
I am enjoying this class.
Character at index x = n
Msg has 24 characters.
D) I am enjoying this class.
I AM ENJOYING THIS CLASS.
I am enjoying this class.
Character at index x = n
Msg has 25characters.

Question 23

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

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

Question 24

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

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

Question 25

What will be displayed as a result of executing the following code? public class test
{
Public static void main(String[] args)
{
Int value1 = 9;
System.out.println(value1);
Int value2 = 45;
System.out.println(value2);
System.out.println(value3);
Value = 16;
}
}

A) 9
45
16
B) 94516
C) 9 45 16
D) Nothing, this is an error

Question 26

What is the result of the following expression? 25 - 7 * 3 + 12 / 3

A) 6
B) 8
C) 10
D) 12

Question 27

If x has been declared an int, which of the following statements is invalid?

A) x = 0;
B) x = -58932;
C) x = 1,000;
D) x = 592;

Question 28

Variables of the boolean data type are useful for

A) working with small integers
B) evaluating true/false conditions
C) working with very large integers
D) evaluating scientific notation

Question 29

To display the output on the next line, you can use the println method or use this escape sequence in the print method.

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

Question 30

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.

Question 31

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 = 27, y = 3, z = 18
D) x = 37, y = 14, z = 4

Question 32

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

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

Question 33

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 = 4
B) x = 22, y = 26
C) x = 22, y = 88
D) Nothing, this is an error

Question 34

Which of the following is not a valid comment statement?

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

Question 35

Variables are classified according to their

A) value
B) data type
C) names
D) location in the program

Question 36

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

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

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) 5.60
B) 5.6
C) 3.0
D) 5.0

Question 38

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) 8
D) 8.0

Question 39

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

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

Question 40

Given the declaration double r;, which of the following statements is invalid?

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

Question 41

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

Question 42

In Java the variable named total is the same as the variable named Total.

Question 43

Which of the following is a valid Java statement?

A) String str = 'John Doe';
B) string str = "John Doe";
C) string str = 'John Doe';
D) String str = "John Doe";

Question 44

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

Question 45

Which Scanner class method reads a String?

A) readString()
B) nextString()
C) getString()
D) nextLine()

Question 46

A Java program will not compile unless it contains the correct line numbers.

Question 47

Assuming that pay has been declared a double, the following statement is valid.
pay = 2,583.44;

Question 48

This is a variable whose content is read only and cannot be changed during the program's execution.

A) operator
B) literal
C) named constant
D) reserved word

Question 49

Which of the following does not describe a valid comment in Java?

A) Single line comments, two forward slashes - //
B) Multi-line comments, start with /* and end with */
C) Multi-line comments, start with */ and end with /*
D) Documentation comments, any comments starting with /** and ending with */

Question 50

Which one of the following methods would you use to convert a string to a double?

A) Byte.ParseByte
B) Long.ParseLong
C) Integer.ParseInt
D) Double.ParseDouble

Question 51

If the compiler encounters a statement that uses a variable before the variable is declared, an error will result.

Question 52

Java is a case-insensitive language.

Question 53

Although the dollar sign is a legal identifier character, you should not use it because it is normally used for special purposes.

Question 54

What will be displayed as a result of executing the following code? int x = 8;
String msg = "I am enjoying java.";
String msg1 = msg.toUpperCase();
String msg2 = msg.toLowerCase();
Char ltr = msg.charAt(x);
Int strSize = msg.length();
System.out.println(msg);
System.out.println(msg1);
System.out.println(msg2);
System.out.println("Character at index x = " +
Ltr);
System.out.println("msg has " + strSize +
" characters.");

A) I am enjoying java.
I AM ENJOYING JAVA.
I am enjoying java.
Character at index x = j
Msg has 20 characters.
B) I am enjoying java.
I AM ENJOYING JAVA.
I am enjoying java.
Character at index x = o
Msg has 20 characters.
C) I am enjoying java.
I AM ENJOYING JAVA.
I am enjoying java.
Character at index x = o
Msg has 19 characters.
D) I am enjoying java.
I AM ENJOYING JAVA.
I am enjoying java.
Character at index x = y
Msg has 19 characters.

Question 55

What will be displayed after the following statements have been executed? final double x = 99.0;
X = 54.3;
System.out.println("x = " + x );

A) x = 54.3
B) x = 99
C) x = 153.3
D) Nothing, this is an error.

Question 56

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

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

Question 57

Class names and key words are examples of variables.

Question 58

All Java statements end with semicolons.

Question 59

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

Question 60

Which Scanner class method reads an int?

A) readInt()
B) nextInt()
C) getInt()
D) read_int()

Question 61

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