Primitive Data Types in Java Programming Language

• Each Variable in Java must have certain type associated with it which tells us what kind of data a variable can store.

• Data Types in Java Programming Language are classified into two main groups – Primitive and Reference Data Types.

Primitive Data Types are:• Data types are predefined by the Java language.

• Predefined data types are Java Reserved keyword

• They cannot be used as variable name inside program/application

• Primitive values do not share state with other primitive values.

• Total Number of Primitive Data Types in Java Programming is 8

Primitive Data Types in Java :

boolean char byte int

short long float double

Type Contains Default Size

boolean true or false false 1 bit

char Unicode Character u0000 16 bits

byte Signed Integer 0 8 bits

short Signed Integer 0 16 bits

int Signed Integer 0 32 bits

long Signed Integer 0 64 bits

float Floating Number 0.0 32 bit

double Floating Number 0.0 64 bit

Data Types in Java :

Live Example : Declaring Integer Variable in Java Programming

• Primitive Variable can be declared using “int” keyword.• Though Integer contain default Initial Value as 0 , still we have to assign 0 to

show assignment in Java.• “+” operator is used to concatenate 2 strings.

• Example "Java" + "Programming" will produce "JavaProgramming".

• Integer is converted into String internally and then two strings are concatenated.

Practice• public static void main(String[] args) {

• String longStr = "This could have been " +

• "a very long line that would have " +

• "wrapped around. But string concatenation " +

• "prevents this.";

• System.out.println(longStr);

• }

• }