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aggregation in java

aggregation is a fundamental concept in object-oriented programming that represents a "has-a" relationship between objects. it is a form of association where one class (the container or whole) contains references to one or more objects of another class (the part or component). the key aspect of aggregation is that the lifetime of the part does not depend on the lifetime of the whole. this means that if the whole is destroyed, the parts can still exist independently.

key characteristics of aggregation:

1. **has-a relationship**: it indicates that one object contains or is composed of another object.
2. **independent lifecycle**: the contained objects can exist independently of the container object.
3. **reusability**: aggregation promotes reusability, as the same objects can be shared across multiple container objects.

example scenario

let's create a simple example to illustrate aggregation in java. we'll use the relationship between `library` and `book`. a `library` can have multiple `book` objects, but the `book` objects can exist independently of the `library`.

code example



explanation of the code:

1. **book class**: represents the part of the aggregation. it has properties like `title` and `author`, and methods to access these properties.

2. **library class**: represents the whole in the aggregation relationship. it has a name and a list of `book` objects. the `addbook` method allows adding books to the library.

3. **aggregationexample class**: the `main` method demonstrates the aggregation relationship by creating instances of the `book` and `library` classes. it shows how books can be added to the library and how they can still exist independently after being added.

conclusion

aggregation is a powerful tool in object-oriented design, allowing for more modular and maintainable code. by understanding and using aggregation, you can create systems where objects have well-defined relationships without tightly coupling their li ...

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