Data Types in Java

 

In Java, data types define the type of data a variable can hold. They are mainly divided into two categories:

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1. Primitive Data Types

These are the most basic data types in Java:

Type	Description	Size	Example
int	Integer numbers	4 bytes	int age = 25;
float	Decimal numbers (single precision)	4 bytes	float temp = 36.5f;
double	Decimal numbers (double precision)	8 bytes	double price = 99.99;
char	Single character	2 bytes	char grade = 'A';
boolean	True or false	1 bit	boolean isJavaFun = true;
byte	Very small integers	1 byte	byte x = 100;
short	Small integers	2 bytes	short y = 10000;
long	Large integers	8 bytes	long z = 100000L;

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2. Non-Primitive (Reference) Data Types

These are objects or classes that store references (memory addresses) to the actual data.

• String – a sequence of characters: String name = "John";

• Arrays – stores multiple values of the same type.

• Classes, Interfaces, Enums – user-defined types used in object-oriented programming.

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Understanding data types is a foundation for writing correct and efficient Java programs. It helps ensure that the right kind of data is stored and manipulated properly. If you’re starting out or looking to sharpen your skills, consider enrolling in the Best Java Training in Kochi to get hands-on experience with practical examples and real-world projects.