Java Aggregation (HAS-A relationship)

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Aggregation (HAS-A)

HAS-A relationship is based on usage, rather than inheritance. In other words, class A has-a relationship with class B, if code in class A has a reference to an instance of class B.

example

class Student
{
 String name;
 Address ad;
}

here we say that student has-a address

Java Aggregation (HAS-A relationship)

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原文地址：http://www.cnblogs.com/morningdew/p/5618879.html