boolean function ( ) { return position != null ; }
tests if there is an element after the pointer position . concode_field_sep Node next concode_elem_sep Node last concode_elem_sep Object data concode_elem_sep Node previous concode_elem_sep Node position concode_elem_sep Node first concode_field_sep void next concode_elem_sep void add concode_elem_sep void set concode_elem_sep void previous concode_elem_sep Pointer listPointer concode_elem_sep Object getLast concode_elem_sep Object removeLast concode_elem_sep void remove concode_elem_sep void addLast concode_elem_sep Object getFirst concode_elem_sep Object removeFirst concode_elem_sep Object get concode_elem_sep boolean hasPrevious concode_elem_sep void addFirst