How to set the focus to a component in java

Assume that you have a text field in your jFrame form and you want the cursor to set to that field after a button click.
If the name of your textField is "textField1" then use the following code as the button action.

textField1.requestFocusInWindow();

How to get the path to the desktop

You can use the following code to get the full path to the current user's desktop folder.

String desktopPath = System.getProperty("user.home") + "/Desktop";
System.out.print(desktopPath.replace("\\", "/"));

How to open an external URL with default browse in Java

try {                                                             

  URI uri = new URI("http://www.google.lk"); //This line may throw

                                               URISyntaxException 

  Desktop desktop = Desktop.getDesktop();

  desktop.browse(uri); //This line may throw URISyntaxException

} catch (URISyntaxException e) {

} catch (IOException e) {

}

How to rename a file in Java

This simple example shows you how to rename a file in Java.

try {

    File oldFile = new File("C:\\a.txt");

    File newFile = new File(C:\\b.txt);

    boolean isSuccess = oldFile.renameTo(newFile);

    System.out.println(isSuccess);

} catch (Exception e) {

    e.printStackTrace();

}