Java Help: Please answer both parts of the question fully:

(a). Write a Java program with a method public String replaceChar(String p, int k, char c) {

}

that given a String p, an int k, and a char c, returns a String with the kth character replaced by c. Of course, 0<=k<=p.length()-1, otherwise, handle it via an exception or error.

(b). Given a two-dimensional square matrix int[][] arr of size n x n where n could be any integer greater than 1, develop the following methods:

1. (i) public void rowSums(int [] [] arr) that prints the sum of the values in each row,comma separated on a single line.

2. (ii) public void columnMins(int [] [] arr) that prints the minimum value in each

   column, comma separated on a single line. For testing purposes, you may initialize the matrix with values from a formula e.g., arr[i][j] = i+j; No need to submit test results.