Data Types In Java

Data types specify the different sizes and values that can be stored in the variable. There are two types of data types in Java:

Primitive data types: The primitive data types include boolean, char, byte, short, int, long, float and double.
Non-primitive data types: The non-primitive data types include Classes, Interfaces, and Arrays.

Java Primitive Data Types

In Java language, primitive data types are the building blocks of data manipulation.

Non-Primitive Data Types

Non-primitive data types are called reference types because they refer to objects.

The main difference between primitive and non-primitive data types are:

Primitive types are predefined (already defined) in Java. Non-primitive types are created by the programmer and is not defined by Java (except for String).
Non-primitive types can be used to call methods to perform certain operations, while primitive types cannot.
A primitive type has always a value, while non-primitive types can be null.
A primitive type starts with a lowercase letter, while non-primitive types starts with an uppercase letter.
The size of a primitive type depends on the data type, while non-primitive types have all the same size.

			Data type
	Primitive Data			Non-Primitive Data
Integer	Decimal	Textual	Logical	String
Byte – 8bit	float – 32bit	char – 16bit	boolean – 1bit	Array
Short – 16bit	double – 64bit			Enum
int – 32bit				Class
long – 64bit				Object

Formula to find the Range of values

-2^n-1to 2^n-1-1

Here, n is the number of bits

Example

byte = 8 bits

-2^8-1to 2^8-1-1 = -128 to 127

Integer Category:

Can store whole numbers

Example: 121, 776688998877

Decimal Category

Can store numbers with decimal point.

Example: 22.3, 234.45, 546456.45, 3.14, 9.8

Textual Category

Can store single character.

Example: M, F

Logical Category:

Can Store only two values either true or false

Default Values of Data Type

Data Type	Value
byte	0
short	0
int	0
long	0
float	0.0f
double	0.0
char	0 or \u0000
boolean	false
Non-primitive	null

Note : This default values are only applicable to instance and class/static variable.

Program :-

public class DataTypes
{
	public static void main(String args[])
	{
	int id = 111;
	char gender = 'f';
	double age = 65522.35767f;
	boolean status = true;

	System.out.println(id);
	System.out.println(gender);
	System.out.println(age);
	System.out.println(status);
	}
}

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Data Types in Java