&雪扇 NAN 对象刻画问题 1902 19 The main issue:How to describe program objects (data structures)? Completely ▣Unambiguously Without overspecifying? (Remember information hiding) Institute of Computer Software 2022-2-27 Nanjing University对象刻画问题  The main issue: How to describe program objects (data structures)?  Completely  Unambiguously  Without overspecifying?  (Remember information hiding) 2022-2-27 Institute of Computer Software Nanjing University 19