Data Types

Question 1

How many primitive types are there in Java?

Answer 1

Eight.

Question 2

What are the different integer types?

Answer 2

int, byte, short, long

Question 3

What are the arthimetic binary operators?

Answer 3

\+, addition
-, subtraction
*, multiplication
/, division
%, modulus

Question 4

What is a floating point number?

Answer 4

A number with a decimal/a fractional number.

Question 5

What are the different floating point types?

Answer 5

float, double

Question 6

How many relational operators are there?

Answer 6

Six

Question 7

How many logical operators are there?

Answer 7

Six

Question 8

What are the different relational operators?

Answer 8

==, equal to
!=, not equal to
>, greater than
=, greater than or equal to
<=, less than or equal to

Question 9

What is a relational operator?

Answer 9

How values can relate and compare with one another.

Question 10

What is a logical operator?

Answer 10

Logical refers to the ways in which true and false values can be connected together.

Question 11

What type represents binary state?

Answer 11

boolean

Question 12

What type represents characters?

Answer 12

char

Question 13

How do you specify a character type?

Answer 13

With single quotes around the character.

‘C’ represents C.

Question 14

How do you declare a variable?

Answer 14

typeName variableName;

Ex. int totalCount;

Question 15

What is the difference between declaring and initializing a variable?

Answer 15

Declaring a variable allocates the required amount of memory.
Initializing a variable assigns a newly declared variable a tangible value.

Question 16

How do you initialize a variable?

Answer 16

variableName = value; if the variable was previously declared.
typeName variableName = value; if it was not.
Ex. totalCount = 123; or
int totalCount = 123;

Question 17

What is the escape character?

Answer 17

Backslash, \

Question 18

How would you display a backslash?

Answer 18

Use the escape character, \

Ex. \

Question 19

How would you display a double quotation mark in a string?

Answer 19

Escape the double quote.

Ex. System.out.println(“Hello, "world!"”);

Question 20

How would you assign a char variable as a single quote?

Answer 20

Escape a single quote.

Ex. char quotationMark = ‘'’;

Question 21

What are the arthimetic compound operators?

Answer 21

\+=
-=
*=
/=
%=