How I can design my custom jframe according to user requirements in JAVA Net Beans in design mode ?

Inside your netbeans project .

1. Right click on one of the packages.

2. select 'New' then 'JFrame Form'

3. rename the Class by your desired name.

4. Now you have your JFrame window, and the Netbeans components 'palette' on the right side of the screen. you can make your own custom design by dragging and dropping those components in the palette