Data Types in Java

 Data Types in Java

Data Type in Java is defined as that specifies the size of memory allocated for a specific variable and which type of value is stored in an identifier. In Java there is mainly two types of data type:-

1. Primitive Data Type

2. Non-Primitive Data Type

for example, int a; //where int is the data type and a is variable

Primitive Data Type

Java defined eight different types of primitive data types like int, short, long, byte, float, double, char, and boolean. Integers group contain four data type int, short, long, byte. The floating-point numbers group contains float and double data type numbers. Char and boolean both are different.

int Data Type

The most commonly used integer type is int. It is a signed 32-bit type that has a range from -2,147,483,648 to 2,147,483,647.

Syntax: <datatype>name of variable  

for example- int b;

short Data Type

short is a signed 16-bit type. It has a range from -32,768 to 32,767. If our value in the program not more than this range then we recommended this type of data type.

Syntax: <datatype>name of variable 

for example: short c;

byte Data Type

This is the smallest integer type of data type. It's range from-128 to 127 and 8-bit requires.

Syntax: <datatype>name of variable 

for example byte d;

long Data Type

long data type is used when int is not large enough to hold the value. It's range -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807. It's require 64-bit in memory.

Syntax: <datatype>name of variable 

for example long e;

Floating-Point Types

Floating -point numbers, are also known as real numbers, are used when evaluating the expression that requires fractional precision. For example, calculations such as the square root of any numbers and other mathematics expressions. It has mainly two types:

1. float

2. double

float Data type

It requires a 32-bit size and sufficient for holding 6 to 7 precision value.

for example: float a=2.5564f

where F defines the float variable

double Data Type

It requires a 64-bit size and sufficient for holding 15 precision value.

double h=2.45247d

where d defines the double variable

boolean Data Type

It stores logical values. It can have only one of two possible values, true or false.

boolean b;

char Data Type

char data type store or hold a character. It requires 16-bit.

for example char ch='M';

Program for data types in java.

public class DataType{

public static void main(String[]args){

int a=2147483647; 

byte b=127;

short c=32767;

long d=12332252626L;

float e=2.1234567F;

double g=2.12345678998765434d;

boolean i=true;

char ch='M';

System.out.println("Integer number is="+a);

System.out.println("byte number is="+b);

System.out.println("short number is="+c);

System.out.println("long number is="+d);

System.out.println("float number is="+e);

System.out.println("double number is="+g);

System.out.println("boolean number is="+i);

System.out.println("char number is="+ch);

}

}

Non-Primitive Data Type

Non-Primitive Data Type is called reference type because they refer to the objects. For example arrays and strings.

Arrays

An array is a group of like type variables that are referred to as a common name. The syntax for declaring an array in java program: data type[] arrayName; or data type arrayName[];

for example double myName[]; or double []myName;

Strings

The String data type is used to store a sequence of characters. Strings must be surrounded by double-quotes.

for example string m="codehubpoint";