? Non-Primitive Data Types in Java

? Quick Overview

Non-primitive data types in Java are used to store complex data and references. They do not store actual values directly, but instead store memory addresses.

? Key Concepts

They are also called reference data types
They can store multiple values or complex structures
They are created using classes or predefined types

? Types of Non-Primitive Data Types

String
Array
Class
Interface
Object

? Syntax / Theory

Non-primitive types are declared using class names or predefined reference types. They always have a default value of null.

? Code Examples

? View Code Example

// Example of String (non-primitive type)
String name = "Java Programming";
System.out.println(name);

? View Code Example

// Example of Array (non-primitive type)
int[] numbers = {10, 20, 30};
System.out.println(numbers[0]);

? Live Output / Explanation

The String example prints the text stored in the string object. The array example prints the first element stored in the array.

✅ Tips & Best Practices

Always initialize reference variables before use
Use meaningful class and variable names
Prefer objects when handling complex data

? Try It Yourself

Create a String array and print all values
Create a class and access its object variables
Compare primitive and non-primitive types