JAVA: Write a single-threaded (must be in thread) program that takes every .txt files in a directory as inputs, copies each content in each input text files. and creates new output files in a different directory that is named after each input text file. Make sure thread does not end until every input file has been read by the program.

example:

assume input1.txt has "hello world"

output1.txt should have "hello world", too.