Monitor text file for changes in Java -

i trying monitor text file change in 1 line of text contains. file being deleted , created same name , path content changes.

i trying construct if statement if content of file changes system print console.

i have looked @ this stack overflow question , tried using java-diff-utils example found on page, not find way implement solve problem.

start generating md5 of original file, using background thread, recalculate md5 , compare original. when hash changes, file contents have changed.

check out md5 hashing example

if you're using java 7, use watcher service monitor changes file. replace thread