How to properly read a text file and use a delimiter to read the comments of a Java Source File

Expected Output after moving a java source file:

Comment Scrape -

1: /*****************************************

2: ** This is my program // Weird comment! **

3: *****************************************/

7: /* Amount available */

14: /* This is my code */

What I have so far..

public static void main(String[] args) throws IOException {

// TODO Auto-generated method stub

Scanner kb = new Scanner(System.in);

System.out.println("Please enter the file name: ");

String sourceFile = kb.nextLine();

// Scanner in = new Scanner(new File(sourceFile));

try {

Scanner in = new Scanner(new File(sourceFile));

String txtFile = sourceFile + ".txt";

PrintWriter fileOut = new PrintWriter(txtFile);

while(in.hasNextLine()) {

String intoTxt = in.nextLine();

fileOut.print(intoTxt);

fileOut.println("");

}

fileOut.close();

File file = new File(txtFile);

int lineNum = 0;

Scanner text = new Scanner(file);

while(text.hasNextLine()) {

} // HERE IS MY PROBLEM. HOW DO I LOOK A TEXT FILE AND MANIPULATE THE STRING TO READ ONLY COMMENTS OF THE JAVA SOURCE FILE

}

catch (FileNotFoundException e) {

System.out.println("Sorry that file does not exist or is not accessible.");

}