Array in Java

An array is a collection of elements of the same type placed in contiguous memory locations that can be individually referenced by using an index to a unique identifier.

  • Array Type : Type of the array. This can be primitive (int, long, byte) or Objects (String, MyObject, etc).
  • Index : Index refers to the position of a certain Object in an array.
  • Length : Every array, when being created, needs a set length specified. This is either done when creating an empty array (new int[3]) or implied when specifying values ({(1, 2, 3)}).

Syntax

Datatype variable_name [ ] ;
(or)
Datatype [ ] variable_name ;

Example

int [ ] array = new int [ 5 ] ;

Code Snippet

//Array in Java

import java.util.Scanner;

public class App {
    // Arrays in Java
    public static void main(String args[]) {
        int a[] = { 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 };
        // Accessing Elements in array
        System.out.println(a[2]);

        // Print all Elements using for loop
        for (int i = 0; i < a.length; i++) {
            System.out.println(a[i]);
        }

        // Print all Elements using Enhanced for loop
        for (int element : a) {
            System.out.println(element);
        }

        int b[]; // Declaring array
        b = new int[10]; // Allocating Memory to Array
        int[] c = new int[10]; // Combining Both Statement

        // Buy default all element have zero value
        for (int element : b) {
            System.out.println(element);
        }

        for (int i = 0; i < 3; i++) {
            Scanner in = new Scanner(System.in);
            System.out.println("Enter The Number");
            c[i] = in.nextInt();
        }

        for (int element : c) {
            System.out.println(element);
        }
    }
}