Day 3: Understanding Data Types in Java

What is a Data Type?

A data type tells Java what kind of data a variable can store.
For example:

• Numbers
• Characters
• True or false values

In Java, data types are mainly divided into two types:

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1. Primitive Data Types

Primitive data types are the basic building blocks in Java.
Java has 8 primitive data types.

Integer types

These are used to store whole numbers:

• int
• byte
• short
• long

Example:

int age = 25;

Boolean type

Used to store true or false values:

• boolean

Example:

boolean isJavaEasy = true;

Decimal (Floating-point) types

Used to store numbers with decimal points:

• float
• double

Example:

double price = 260.30;

Character type

Used to store a single character:

• char

Example:

char grade = 'A';

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2. Non-Primitive Data Type

Non-primitive data types are more complex and can store multiple values.

String

The main non-primitive data type is:

• String

A String is used to store text or words.

Example:

String name = "Karthick";