JAVA

I'm trying to use the method to determine the frequency of letters used in a command line args input by user.

However for this code, it counts every letters that didn't appeared, which is 0 used. In the picture of the output, I only want the Least frequently used letter to output, which is : t, h, m, y, b, k

How can I change my code to get this output?

Question:

How to change the code so that the output is the leaset used words in alphabetic table?

import java.util.*; public class PAf public static double getAverageWorldiength(String[] words) I 1 ASUSQLAPTOP-SOMKDA2M MINGW64 4/Project2/src $ java PA. Java This is my book shortest words: is, my Largest words: This, book Average 7ength: 3.00 Most frequently used letter (s): i o s import java.util.*; public class PAf public static double getAverageWorldiength(String[] words) I 1 ASUSQLAPTOP-SOMKDA2M MINGW64 4/Project2/src $ java PA. Java This is my book shortest words: is, my Largest words: This, book Average 7ength: 3.00 Most frequently used letter (s): i o s