For future reference, you can iterate over the UIDefaults to check the UI options available and search for the specific key you need to set the UI default value
UIDefaults ui =...
Type: Posts; User: copeg
For future reference, you can iterate over the UIDefaults to check the UI options available and search for the specific key you need to set the UI default value
UIDefaults ui =...
If you wish this to apply to all JMenuItems across your application, use the UIManager to set the look and feel defaults for MenuItem.selectionBackground and MenuItem.background.
...otherwise,...