Aggregation in Java

Association:- Association is to show the relationship between two or more class. It shows Has-a-relationship.

We have tow association concept to show the Has-a- relationship

1. Aggregation

2. Composition

Here I will discuss Aggregation

Aggregation: Aggregation represent has a relationship, It show a weak relationship, means one class is weakly depend on another class.

Ex:- Suppose we have a car class and music class, so without music class car class can execute.

class Music{

private String songName;

Music(String songName){

this.songName=songName;

}

public String getsongName() {

return songName;

}

}

class Car{

private String Name;

private Music m;

Car(String Name, Music m){

this.Name=Name;

this.m=m;

}

public String getName() {

return Name;

}

public Music getMusic() {

return m;

}

}

public class Agreegation {

public static void main(String[] args) {

Music m1=new Music("Aashain hai");

Car c1=new Car("RR",m1);

System.out.println(c1.getName()+" music is "+c1.getMusic().getsongName());

}

}