You are given a 0-indexed 1-dimensional (1D) integer array original, and two integers, m and n. You are tasked with creating a 2-dimensional (2D) array with m rows and n columns using all the elements ...

This Java program calculates the sum of all elements in a given 2D integer array. The Sum2DArray class contains a method calculateSum(int[][] arr) that iterates through a 2D array and calculates the ...