JTextArea JLabel compare two txt. files line by line

Question

everybody. I have completed my code two txt files by showing on the same area.

but I want to compare two txt files line by line. and I want to show the differences with

Answer 1

You might need to ask user to upload both versions of file.

In the server you need to compare line by line, and store the line numbers of the file differences in another file or location

Then, while displaying, get the line numbers and give them proper decoration (i.e bold etc.).