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What’s the Difference Between Primitive and Reference Data Types In Java?

Naveen Metta
4 min readJan 18, 2025

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In Java programming, understanding data types is like knowing the different kinds of containers you can use to store your things. Today, we’ll look at two main groups of data types that Java offers: primitive types and reference types. We’ll break this down in simple terms so you can easily understand when and how to use each one.

What Are Data Types?

Before we dive deep, let’s understand what data types are. Think of data types as different kinds of boxes that can hold different kinds of things. Just like you wouldn’t put soup in a shopping bag or clothes in a water bottle, each data type in Java is made to hold specific kinds of information.

Primitive Data Types: The Simple Containers

Primitive data types are the most basic data types in Java. They’re like simple, single-compartment boxes that can hold only one basic value at a time. Java has eight primitive data types:

// Number types
byte smallNumber = 127; // For very small numbers
short mediumNumber = 32000; // For medium-sized numbers
int regularNumber = 2000000; // For regular numbers (most common)
long bigNumber = 9000000000L; // For very big numbers

// Decimal…

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Naveen Metta
Naveen Metta

Written by Naveen Metta

I'm a Full Stack Developer with 3+ years of experience. feel free to reach out for any help : mettanaveen701@gmail.com

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