question: private void paintBackground ( Graphics2D g , JComponent c , int width , int height , ButtonColors colors ) { g . setRenderingHint ( RenderingHints . KEY_ANTIALIASING , RenderingHints . VALUE_ANTIALIAS_OFF ) ; g . setColor ( colors . top ) ; g . drawLine ( 0 , 0 , width - 2 , 0 ) ; g . setColor ( colors . left ) ; g . drawLine ( 0 , 1 , 0 , height - 3 ) ; g . setColor ( colors . edge ) ; g . drawLine ( width - 1 , 0 , width - 1 , height - 2 ) ; g . drawLine ( 0 , height - 2 , width - 2 , height - 2 ) ; g . setColor ( colors . shadow ) ; g . drawLine ( 0 , height - 1 , width - 1 , height - 1 ) ; g . setColor ( colors . interior ) ; g . fillRect ( 1 , 1 , width - 1 , height - 2 ) ; }
target:  Paint the background of the button using the specified colors.