17. Aggregation In Java


✔ JAVA CHAPTERS:-

1. Introduction to Java
2. Features of Java
3. Java Virtual Machine
4. D/F B/W JVM, JRE, JDK
5. Java Data Types
6. Java Programs
7. Setting Java Path
8. OOPs Concepts
9. Object & Class In Java
10. OOPs Continued
11. Encapsulation & Polymorphism
12. Method Overloading
13. Method Overriding
14. Dynamic Method Dispatch
15. Association In Java
16. Inheritance in Java
17. Aggregation in java
18. Command Line Argument
19. Execute Command Line
20. Read Input From Command Line
21. Abstract Class In Java
22. Interface in Java
23. Cutom Marker Interface
24. Constructor In Java
25. Package in Java
26. Acess Modifier In Java
27. Static Import In Java
28. Package Class In Java
29. This Keyword
30. Instance Intializer Block
31. Super Keyword
32. Static Keyword
33. Final Keyword



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Aggregation In Java

Aggregation is a type of HAS-A relationship. Aggregation represents a type of relationship between two objects in which one contain the other’s reference. Two objects can exist independently. If one is deleted other can still exist.

Aggregation in real world:

Let us take the example: A room has a chair. Here room object contain the chair object. Both room and chair exist independently.

Example:

/**
 * This is used to show simple aggregation example.
 * @author javatutorialpoint
 */
class Chair{
      public void show(){
            System.out.println("show chair details.");
      }
}
 
public class RoomTest {
      public static void main(String args[]){
            //Chair class object in RoomTest class
            Chair obj = new Chair();
            obj.show();
      }
}

Output:

show chair details.
Note: Aggregation is mainly used for code re-usability.


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