question: protected int keyOnList ( String key , List < String > list ) { int ret = - 1 ; int index = 0 ; if ( list != null ) { for ( String listKey : list ) { if ( listKey . equalsIgnoreCase ( key ) ) { ret = index ; break ; } index ++ ; } } return ret ; }
target:  Figure out if the string key is in the provided list, and provide the location index of it is.