Please Explain every line in detail:

package javaapplication61; public class JavaApplication61 { public static int findSmallestElementIndex(int[] arr) { int smallestElement = arr[0]; int smallestElementIndex = 0; for (int i = 1; i < arr.length; i++) { if (arr[i] < smallestElement) { smallestElement = arr[i]; smallestElementIndex = i; } } return smallestElementIndex; } public static int sumTwoDimensionalArray(int[][] arr) { int sum = 0; for (int i = 0; i < arr.length; i++) { for (int j = 0; j < arr[i].length; j++) { sum += arr[i][j]; } } return sum; } public static void main(String[] args) { int[] oneDimensionalArray = {3, 1, 4, 1, 5}; int smallestElementIndex = findSmallestElementIndex(oneDimensionalArray); System.out.println("Smallest element index: " + smallestElementIndex);

int[][] twoDimensionalArray = {{1, 2}, {3, 4}}; int sum = sumTwoDimensionalArray(twoDimensionalArray); System.out.println("Sum of two dimensional array: " + sum); } }