JAVA: create a program that reads all text files in a directory, calculates the occurrences of words, and saves the result in one single output text file.

assume that you are in a directory called Desktop/programdirectory, where you have multiple text files.

textfile1.txt : "how are you"

textfile2.txt: "great thank you"

textfile3.txt: "great to see you. see you later"

Then, your output.txt should have:

how: 1

are: 1

you: 4

great: 2

thank: 1

to: 1

see: 2

later: 1