Shulou(Shulou.com)06/03 Report--

Relationship: class A needs an object reference or pointer of class B as a parameter when it is instantiated

Dependency: a method of class A uses class B, either because the parameter of the method is class B or because an instance of class B is obtained in the method

A class appears in another class in the form of member variables, the two are associated; a class appears in the form of local variables in another class, the two are dependent.

Aggregation relationship: weak correlation, whole and part can exist independently

Combinatorial relationship: strong relevance, the whole and the part are inseparable and cannot exist independently.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.