Set Icon Image in Java application (Remove default Icon) - NetBeans

For demonstrating purpose I'll create a Project name BloggerEx and in that I have Blogger.java (jFrame)

First of all in your jFrame,

1. In Navigator bar select jFrame, double click it and go to properties or properties tab will show on right side of the NetBeans application.
(You have to select design view, otherwise navigator bar won't show.



If you run the application it will show the default java icon on the upper-left corner.
Now select iconImage property from the properties window.





2. Select the 'iconImage' property and it will show the separate window to change Image icon.
    Select Custom code.





(If you don't have specific icon to set, choose now and copy that icon to project folder,
go to src folder in the project,
select the project name folder, (If you create project name 'My' this folder will be 'my')
Paste the icon in to the folder)

3. Now type the Code as below.
    Note: when you typing the code it may not give the code suggestion sometimes

new javax.swing.ImageIcon(getClass().getResource("/bloggerex/cowboy.png")).getImage()

   Note: ("/bloggerex/cowboy.png") = bloggerex is my project name and cowboy.png is the icon name.
             You can change those with your project name and icon name.

4. Click ok and run the project or jFrame.




Enjoy coding!...
If you have any questions pls feel free to ask :)