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InterviewSolution
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Aggregation in Java |
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Answer» Aggregation is a type of weak association that specifies a HAS-A relationship. Both the objects of a class in an aggregation can EXIST individually. Also, aggregation is a one-way relationship. For example - A class in a school has STUDENTS but the opposite is not true. A program that demonstrates aggregation in Java is given as FOLLOWS: class School { private String name; School(String name) { this.name = name; } public String retClassName() { return this.name; } } class Student { private int rno; private String name; Student(int rno, String name) { this.rno = rno; this.name = name; } public String retStudentName() { return this.name; } } public class AssociationDemo { public static void main (String[] args) { School c = new School("XII B"); Student s1 = new Student(1, "John"); Student s2 = new Student(2, "Susan"); Student s3 = new Student(3, "Mary"); Student s4 = new Student(4, "ADAM"); Student s5 = new Student(5, "Lucy"); System.out.println("The students in school class " + c.retClassName() + " are:") ; System.out.println(s1.retStudentName()); System.out.println(s2.retStudentName()); System.out.println(s3.retStudentName()); System.out.println(s4.retStudentName()); System.out.println(s5.retStudentName()); } }The output of the above program is as follows: The students in school class XII B are: John Susan Mary Adam LucyIn the above program, there is a HAS-A relationship between School class and student as a class in a school has multiple students. |
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