First make sure to create your icons and add them to your project. This will allow you to select the icon from a combobox and display the icon in the design editor. You can do the work by hand, but this will not allow you to see your work without running the program.
Once you are ready to add a button, select the JButton component from the component pallet.
| After placing the button in the toolbar, naming the button and deleting its text property value (removing the text from the button face), select the icon from the icon combobox. |  |
| Now your Toolbar will show the new icon(s) |  |