Multiplicity!y(多重性) Multiplicity indicates the number of instances of a class that may be associated with a single instance of another class 多重性就是一个类有多少个实例与另外一个类的实例相关 联 Car has four tires and one engine One client holds one or more bank accounts a professor can instruct more than one student The multiplicity can be specified with a single integer or as a range n, n= n.m,n代表最小值,m代表最大值19 Multiplicity(多重性) • Multiplicity indicates the number of instances of a class that may be associated with a single instance of another class. – 多重性就是一个类有多少个实例与另外一个类的实例相关 联 – Car has four tires and one engine – One client holds one or more bank accounts – A professor can instruct more than one student • The multiplicity can be specified with a single integer or as a range – n，n=1,2,3,… – n…m，n代表最小值，m代表最大值