using java please

explan the code please

Question 2 is divided into 2 sections: 2.1, 2.2 When working with matrices that contain a lot of zeros, a more efficient representation is needed in terms of space: instead of maintaining a two-dimensional array with all the information, it is enough to maintain a one-dimensional array that keeps only the different organs 0. In this question you will implement a method that converts a two-dimensional array of numbers into a one-dimensional array of objects.

Write a class called Element. The class represents an element in a two-dimensional array of real numbers (that is, numbers that are double)

The class has three fields (attributes) that represent: row, column, and cell contents

A real constructor that assigns three parameters (in order: row, column, cell contents ) And initializes the three fields

Realizes method (0) toString which returns the cell representation in the format "[row, column, data] for: row - the row number, col - the column number, data - the contents of the cell.

For example for the cell in row 1 And in column 2 which contains a the number 4.5 the string to be returned is: "[1,2,4.5]

Signature method: public string toString ()

Note: The first row is index 0, the first column is index 0.

For example, a cell in the first row and a second column is represented by an object with row 0 and column 1.