? Java Array Basics

? Quick Overview

An array in Java is a fixed-size data structure used to store multiple values of the same data type under a single variable name.

? Key Concepts

Arrays store elements of the same data type
Array size is fixed after creation
Index starts from 0
Arrays are objects in Java

? Syntax / Theory

Arrays can be declared first and initialized later, or both can be done in a single statement.

? View Code Example

// Declaring an integer array
int[] numbers;

// Allocating memory for 5 integers
numbers = new int[5];

? Code Example

? View Code Example

// Array creation and initialization
int[] marks = {85, 90, 78, 92, 88};

// Accessing array elements using index
System.out.println(marks[0]);
System.out.println(marks[3]);

? Live Output / Explanation

Output

85
92

The program prints values stored at index 0 and index 3 of the array.

? Interactive Visualizer

Create your own array and practice accessing elements by index.

System.out.println( array[ ] );

> Ready to run...

✅ Tips & Best Practices

Always check array length before accessing elements
Use loops to process arrays efficiently
Prefer enhanced for-loop for read-only operations

? Try It Yourself

Create an array of 10 integers and print all values
Find the sum of elements in an array
Find the largest element in an array