Aggregation in Java

→ Aggregation represents HAS-A relationship.

Address.java

public class Address {
String city,state,country;

public Address(String city, String state, String country) {
	this.city = city;
	this.state = state;
	this.country = country;
}

}

Student.java

 public class Student {
    int id;
    String name;
    Address address;
public Student(int id, String name,Address address) {
	this.id = id;
	this.name = name;
	this.address=address;
}
void display(){
System.out.println(id+" "+name);
System.out.println(address.city+" "+address.state+" "+address.country);
}
public static void main(String[] args) {
Address add=new Address("Noida","UP","India");
Student s=new Student(01,"Chery",add);
s.display();	
}}
 

Output

→ Student has an object of Address, address object contains its own informations such as city, state, country etc. In such case relationship is Student HAS-A address.

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OOPs Concepts

Aggregation in Java

Address.java

Student.java