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  2. Aggregation between classes

    Aggregation is a special form of association that represents a has-a relationship between two classes1. Aggregation is also known as a whole-part relationship, because one class (the whole) has a reference to another class (the part) as an attribute2.

    Aggregation is different from composition, which is a stronger form of whole-part relationship, where the part cannot exist without the whole. In aggregation, the part can exist independently of the whole, and the whole is not responsible for the creation or destruction of the part2.

    Aggregation is also different from a simple association, which is a more general relationship between two classes that does not imply ownership or containment. In aggregation, the whole has a more specific role and purpose than the part, and the part contributes to the functionality or characteristics of the whole3.

    Here is an example of aggregation between classes in Java:

    // A class that represents a student
    class Student {
    String name;
    int id;
    String dept;

    Student(String name, int id, String dept) {
    this.name = name;
    this.id = id;
    this.dept = dept;
    }
    }

    // A class that represents a department
    class Department {
    String name;
    private List<Student> students; // An attribute that references a list of Student objects

    Department(String name, List<Student> students) {
    this.name = name;
    this.students = students;
    }

    public List<Student> getStudents() {
    return students;
    }
    }

    // A class that represents an institute
    class Institute {
    String instituteName;
    private List<Department> departments; // An attribute that references a list of Department objects
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  3. Aggregation in Java - W3Schools

  4. People also ask
    What is an aggregation?An aggregation is a form of association where the relation of Association can be considered the containing class 'owning' the contained class. The lifetime of that relationship cannot be defined. 'Owning' can be determined as a single-direction Association.
    What is an example of aggregation in Java?In this example, we have two classes: Address and Person. The person contains an instance variable of type Address. This is an example of aggregation because the Person class is composed of an Address object. The Address class has a constructor that takes in four parameters: street, city, state, and zip code.
    What does aggregate mean in Java?Aggregation implies ownership, not just association Aggregation in Java is a relationship between two classes that is best described as a "has-a" and "whole/part" relationship. It is a more specialized version of the association relationship. The aggregate class contains a reference to another class and is said to have ownership of that class.
    Why is aggregation important in Java?Furthermore, key attributes such as inheritance, polymorphism, and aggregation help make Java an incredibly flexible and versatile language. Aggregation, also known as a “has-a” relationship, is a vital principle in Java programming. It defines the relationship between two classes where one class (aggregate) can contain the other (component).
  5. Composition, Aggregation, and Association in Java | Baeldung

  6. Association, Composition and Aggregation in Java

    WebMar 21, 2024 · Aggregation is a form of association where one class has a reference to another class as a whole. Learn the concept of …

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      WebJan 3, 2023 · Learn the difference between association, aggregation and composition, three types of relationships between classes in Java. See examples of code and real-life scenarios for each type of relationship.

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    • Aggregation (HAS-A relationship) in Java - Studytonight

      WebAggregation is a one-way relationship between two classes, where one class has a reference to another class. Learn how to use aggregation in Java with examples of Student-Address and Author-Book relationships, …

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      WebLearn what aggregation is and how to implement it in Java with examples. Aggregation is a one-way relationship that supports HAS-A relation between classes, such as Employee has a Car or a Bike.

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    • Association, Composition, and Aggregation in Java

      WebMar 28, 2023 · Association represents a simple connection between classes, Composition depicts a strong "whole-part" relationship, and Aggregation signifies a more loosely coupled association. This article …

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