In java please

// TODO file header

import java.util.Arrays;

import java.util.Random;

import java.util.Scanner;

/**

* TODO Write a summary of the role of this class in the

* MasterMind program.

*

* @author TODO add your name here

*/

public class MasterMind {

/**

* Returns the index within arr of the first occurrence of the specified character.

* If arr is null or 0 length then return -1. For all arrays, don't assume a length

* but use the array .length attribute.

* @param arr The array to look through.

* @param ch The character to look for.

* @return The index within the array of the first occurrence of the specified

* character or -1 if the character is not found in the array.

*/

public static int indexOf(char[] arr, char ch) {

return 0;

//TODO replace

}