Java - Write code to Place a post fix on a filename just before the extension dot.

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Requirements

Write code to Place a post fix on a filename just before the extension dot.

Demo

//package com.book2s;

public class Main {
    public static void main(String[] argv) {
        String filename = "book2s.com";
        String postfix = "book2s.com";
        System.out.println(postfixFilename(filename, postfix));
    }//  ww w  .  j  a  v  a 2s.co m

    /**
     * Places a post fix on a filename just before the extension dot.
     */
    public static String postfixFilename(String filename, String postfix) {
        int index = filename.lastIndexOf(".");
        return (filename.substring(0, index) + postfix + filename
                .substring(index));
    }
}

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