question: private void updateSystemIcon ( ) { Window window = getWindow ( ) ; if ( window == null ) { systemIcon = null ; return ; } java . util . List < Image > icons = window . getIconImages ( ) ; assert icons != null ; if ( icons . size ( ) == 0 ) { systemIcon = null ; } else if ( icons . size ( ) == 1 ) { systemIcon = icons . get ( 0 ) ; } else { systemIcon = SunToolkit . getScaledIconImage ( icons , IMAGE_WIDTH , IMAGE_HEIGHT ) ; } }
target:  Update the image used for the system icon