K function ( ) { Entry < K > loc0 = head ; return loc0 == null ? null : loc0 . obj ; }
get the first element , or null if none . concode_field_sep Entry<K> head concode_elem_sep Entry<K> next concode_elem_sep Entry<K> tail concode_elem_sep K obj concode_field_sep void add concode_elem_sep Iterator<K> iterator concode_elem_sep boolean removeFirst concode_elem_sep K peekLast concode_elem_sep boolean removeLast