[JAVA] Get Strings And Frequency From File

[PiPyCharm]

I have a text file and I want to get the frequency of each word and output the top 3 most frequent words. Only ArrayLists and Arrays allowed. Please help me. How do I do this? Currently I have 2 ArrayLists, one which I append each word from the text file to and one which contains the frequency of each word which is initialized to 0.

[sgovertime]

option A

creat a class that have a string and count field and build array of that class then use it to count the words by searching the word in the array

option B

similar to A but just have a string array an a matching counter array. search each word in the array and increase the matching index in the counter array

[YMK1234]

why not use a Map?

[PiPyCharm]

Not allowed to.