What is jagged array?

Question

https://www.sololearn.com/discuss/650059/?ref=app

Answer 1

An array within an array.

Answer 2

Jagged array is array of arrays such that member arrays can be of different sizes, i.e., we can create a 2-D arrays but with variable number of columns in each row. These type of arrays are also known as Jagged arrays.

Following are Java programs to demonstrate the above concept.

// Program to demonstrate 2-D jagged array in Java

class Main

{

    public static void main(String[] args)

    {

        // Declaring 2-D array with 2 rows

        int arr[][] = new int[2][];

        // Making the above array Jagged

        // First row has 3 columns

        arr[0] = new int[3];

        // Second row has 2 columns

        arr[1] = new int[2];

        // Initializing array

        int count = 0;

        for (int i=0; i<arr.length; i++)

            for(int j=0; j<arr[i].length; j++)

                arr[i][j] = count++;

        // Displaying the values of 2D Jagged array

        System.out.println("Contents of 2D Jagged Array");

        for (int i=0; i<arr.length; i++)

        {

            for (int j=0; j<arr[i].length; j++)

                System.out.print(arr[i][j] + " ");

            System.out.println();

        }

    }