【摘要】 主要研究了ＯＯ模型中继承关系形成格等代数性质，提出了对象的一阶分类与二阶分类及类型链、类型分层的概念。更多还原

【Abstract】 Some algebraic properties,such as the relation of inhertance of classes forming lattice,of OO modeling are studied and the concepts of the first and the second stage classifications of objects。class chain and class level are proposed。更多还原