Web Reference: Jan 20, 2026 · Aggregation is an object-oriented programming relationship that represents a “has-a” association with weak ownership. In aggregation, the contained object can exist independently of the container, making it useful for building modular and reusable software components. Feb 10, 2026 · Aggregation in Java represents a HAS-A relationship where one class contains a reference to another class. In this chapter, we will learn about the aggregation with definition and real-life examples. Learn what aggregation is and how to use it in Java. Aggregation is a relation between two classes that is a has-a and whole/part relationship, and it is a form of association for code reusability.
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