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Example - Display Extension
Posted on: July 26, 2006 at 12:00 AM
This program reads in a file name and displays the extension (that last part of the name after the final dot).

Java: Example - Display Extension

This program reads in a file name and displays the extension (that last part of the name after the final dot).

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// Purpose: Display the extension (with .) of a file name.
// File   : extension/FileExt.java
// Author : Fred Swartz
// Date   : 2005-09-06

import javax.swing.*;

public class FileExt {

    public static void main(String[] args) {
        //... Declare local variables.
        String fileName;   // The file name the user entered.
        String extension;  // The extension.

        //... Input a file name and remove whitespace.
        fileName = JOptionPane.showInputDialog(null, "Enter file name.");
        fileName = fileName.trim();

        //... Find the position of the last dot.  Get extension.
        int dotPos = fileName.lastIndexOf(".");
        extension = fileName.substring(dotPos);

        //... Output extension.
        JOptionPane.showMessageDialog(null, "Extension is " + extension);
    }
}
Copyleft 2005 Fred Swartz MIT License
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