The main purpose is to compare two files and match the contents of one file in order to get the line number of that match!

One of the files has code comments! And the other has the source code from where the comments where extracted!

Example:
File1.txt

public class Finger { //Commment 1
public static void main(String[] arguments) {//com 2
        String user; 
        String host;
//comm3
[download]

File2.txt

//Comment 1
//com 2
//comm3
[download]

Result

Line 1: //Comment 1
Line 2: //Com 2
Line 5: //comm3
[download]

Thank you all for your help!!