Java open url in default system browser

open a url in system default browser - work for all  : windows, mac, linux operating systems

Full working JAVA source code example
public class StartBrowserUtil {
    private StartBrowserUtil() {
    public static void openURL(String s) {
        String s1 = System.getProperty("").toLowerCase();
        Runtime runtime = Runtime.getRuntime();
        try {

Java Image Processing : Negative of Input Image - source code

The code below is for getting negative of an input image in JAVA:

public class TestImagesss {
    public static void main(String[] args) {
        BufferedImage org = getImage("test.jpg");
        BufferedImage negative = getNegativeImage(org);
        new ImageFrame(org, "Original");
        new ImageFrame(negative, "After Negative");

java hex -int-string-byte conversion source code

Hexadecimal conversion - string, byte, integer - working java source code example :

public final class HexConvertUtils {

    private HexConvertUtils() {

    public static byte[] toBytesFromHex(String hex) {

Java delete a folder and subfolders recursively

Java source code for deleting a folder and subfolders recursively.
Code for copying and moving files is here.
Working source code example:
public final class FileIOUtility {
    private FileIOUtility() {}
    public static boolean deleteFile(File fileToDelete) {
        if (fileToDelete == null || !fileToDelete.exists()) {
            return true;
        } else {

Java - contro lkeyboard 'lock key' state programmatically

Java Controlling the lock keys : Caps Lock, Scroll Lock, Num Lock 's state - programmatically
public class Lock_Key_Control_In_Java {
    public static void main(String[] args) {
        Toolkit tk = Toolkit.getDefaultToolkit();

        //enable disable key state Caps Lock, Scroll Lock, Num Lock keys
        tk.setLockingKeyState(KeyEvent.VK_NUM_LOCK, true);
        tk.setLockingKeyState(KeyEvent.VK_CAPS_LOCK, false);
        tk.setLockingKeyState(KeyEvent.VK_SCROLL_LOCK, false);
The lock keys LED in the keyboard should be  turned ON or OFF ?

Java: Loading images in JFrame - Reusable ImageFrame

Sometimes we need to show multiple images in separate window by using single line statement :
new ImageFrame(inImg, "Input Image ");// inImg is reference to Image object
The code below can be used to load images in JFrame as a separate window.

java copy file, move file code example

Java source code - copying a file , moving a file - working source code example :
Code for deleting a folder and sub folder recursively is here 
public final class FileIOUtility {
    private FileIOUtility() {}
    public static void moveFile(File src, File targetDirectory) throws IOException {
        if (!src.renameTo(new File(targetDirectory, src.getName()))) {
            String str = (new StringBuilder()).append("Failed to move ").append(src).append(" to ").append(targetDirectory).toString();
            throw new IOException(str);
        } else

Installing Android SDK, ADT in eclipse

How to Install Android SDK, ADT
Step 0: Read the Documentations - 
Start from Android's mother site @

Android: Introduction to android platform - framework

Brief Introduction

Android is an Operating System for mobile devices developed by Google, which is built upon Linux kernel. Android competes with Sambian OS,

Final Year Computer Project Suggestion, A HUGE LIST

Here is a list of project suggestion for final year project (BE computer).
I have collected them from various sites.

Screen capture Utility , Automatic Video Tutorial Maker
HTML Editor - text processing
Image Search engine using image clustering
Semantic WEB
PCI/USB FM RadiPlayer with Tunning, Volume Control, and capture feature
LAN Based Bit Torrent
Automatic Friend tagging on Facebook based on Face Recognition
Hostel Election Software
Collaborative Web Browsing
Web based Application for Multiple Clients
MAC Layer Scheduling in Ad-hoc Networks
Smart Mail Transfer Protocol
Windows Multi File Search utility
FTP Explorer
Harddisk data recovery tool
Consumer-oriented devices and services
Mobile TV and IPTV
Telemedicine portals
Gesture Recognition using ANN or HMM or ..
TCPIP Chat client server