Question 1

Which of the following correctly initializes a boolean variable in Java?

Accepted Answer

boolean isActive = true;

Answer

boolean isActive = 'true';

Answer

boolean isActive = 1;

Answer

isActive boolean = true;

Question 2

What must the first character of a variable name in Java look like?

Accepted Answer

It must be a letter, underscore, or dollar sign.

Answer

It can be any character.

Answer

It must be a number.

Answer

It must be a space.

Question 3

Which of the following is the correct way to declare a string variable in Java?

Accepted Answer

String greeting = "Hello";

Answer

String greeting = 'Hello';

Answer

greeting String = "Hello";

Answer

String greeting = Hello;

Question 4

Which data type would you use to store a very large integer in Java?

Accepted Answer

long

Answer

short

Answer

int

Answer

float

Question 5

Which of the following is a valid variable declaration in Java?

Accepted Answer

int number = 10;

Answer

number int = 10;

Answer

float number = '10';

Answer

int 10 = number;

Question 6

What data type would you use to store a character in Java?

Accepted Answer

char

Answer

int

Answer

String

Answer

boolean

Question 7

Which of the following variable names is valid in Java?

Accepted Answer

myVariable

Answer

2ndVariable

Answer

my variable

Answer

my-variable

Question 8

What is the default value of an integer variable in Java?

Accepted Answer

0

Answer

null

Answer

-1

Answer

1

Question 9

Which Java data type is used to represent true or false values?

Accepted Answer

boolean

Answer

char

Answer

float

Answer

int

Question 10

What data type would you use to store a decimal number in Java?

Accepted Answer

double

Answer

int

Answer

boolean

Answer

char

Question 11

What does the 'String' datatype represent in Java?

Accepted Answer

A sequence of characters

Answer

A boolean value

Answer

A single character

Answer

A number

Question 12

What is the size of an 'int' variable in Java?

Accepted Answer

4 bytes

Answer

1 byte

Answer

2 bytes

Answer

8 bytes

Question 13

Which of the following datatypes can hold true or false values in Java?

Accepted Answer

boolean

Answer

string

Answer

char

Answer

int

Question 14

What keyword is used to create a constant variable in Java?

Accepted Answer

final

Answer

const

Answer

constant

Answer

static

Question 15

Which of the following is a valid datatype for storing a whole number in Java?

Accepted Answer

int

Answer

boolean

Answer

float

Answer

char

Question 16

What keyword is used to declare a variable in Java?

Accepted Answer

int

Answer

declare

Answer

variable

Answer

define

Question 17

Which of the following datatypes is used to store a single character in Java?

Accepted Answer

char

Answer

int

Answer

string

Answer

float

Question 18

Which of the following is a valid way to initialize a variable in Java?

Accepted Answer

int a = 5;

Answer

int a := 5;

Answer

int = 5;

Answer

a int = 5;

Question 19

What is the default value of a boolean variable in Java?

Accepted Answer

false

Answer

0

Answer

true

Answer

null

Question 20

What datatype would you use to store decimal numbers in Java?

Accepted Answer

double

Answer

int

Answer

boolean

Answer

char

Question 21

Which of the following is a valid data type in Java?

Accepted Answer

int

Answer

character

Answer

string

Answer

float64

Question 22

What data type would you use to represent a true or false value in Java?

Accepted Answer

boolean

Answer

char

Answer

int

Answer

string

Question 23

Which of the following is the proper way to declare a variable in Java?

Accepted Answer

int number;

Answer

number: int;

Answer

int; number

Answer

int number

Question 24

Which of the following data types can hold decimal values in Java?

Accepted Answer

double

Answer

char

Answer

boolean

Answer

int

Question 25

What is the correct way to create a variable that holds a single character in Java?

Accepted Answer

char letter;

Answer

character letter;

Answer

char; letter

Answer

string letter;

Question 26

What will be the output of the following code snippet: int a = 5; System.out.println(a); ?

Accepted Answer

5

Answer

0

Answer

10

Answer

Error

Question 27

Which data type is used to store a sequence of characters in Java?

Accepted Answer

String

Answer

boolean

Answer

char

Answer

int

Question 28

What is the default value of an uninitialized boolean variable in Java?

Accepted Answer

false

Answer

null

Answer

0

Answer

true

Question 29

Which of the following is NOT a primitive data type in Java?

Accepted Answer

String

Answer

int

Answer

char

Answer

boolean

Question 30

Which data type would you use to represent a whole number in Java?

Accepted Answer

int

Answer

double

Answer

float

Answer

string

Related quizzes

Related quizzes