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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 studentclass 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 departmentclass Department {String name;private List<Student> students; // An attribute that references a list of Student objectsDepartment(String name, List<Student> students) {this.name = name;this.students = students;}public List<Student> getStudents() {return students;}}// A class that represents an instituteclass Institute {String instituteName;private List<Department> departments; // An attribute that references a list of Department objectsLearn more✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.Aggregation in Java - Javatpoint
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Explanation: In the above program, class A3 inherits class A2, and class A2 …
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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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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.
Tags:Association and Aggregation in JavaExamples of Aggregation Java+3Java Aggregation RelationshipObject-oriented ProgrammingHAS-AAssociation, 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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