use your own linkedlist class.write this code in java.You are going to work on Huffman Coding in this homework. uPlease do the following;

$1-$ Find the characters and their frequencies of a given text which will be read from letter.txt file.

$2-$ Keep these in a sorted linked list $($use your own linked list class$).$

$3-$ Construct the huffman tree using this alfabet$($characters$).$

$4-$ Find the code of every character and display them.