question: checks that the given argument is not null . if it is , throws nullpointerexception . otherwise , returns the argument . concode_field_sep PlaceHolder placeHolder concode_field_sep int checkPositiveOrZero concode_elem_sep int intValue concode_elem_sep int checkPositive concode_elem_sep long checkPositive concode_elem_sep T[] checkNonEmpty concode_elem_sep long longValue
target: T function ( T arg0 , String arg1 ) { if ( arg0 == null ) { throw new NullPointerException ( arg1 ) ; } return arg0 ; }