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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 CodesJava
 */
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.

Download this example.

Note: Aggregation is mainly used for code re-usability.
 
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Method overloading in java with example.
Method overriding in java with example.
Dynamic method dispatch or Runtime polymorphism in java with example.
Association in java with example.
Inheritance in java with examples.
Aggregation in java with example.

 

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