Java OCA OCP Practice Question 2533

Question

Consider the following program and predict the output: 

import java.util.HashSet;

class Shape{
     public Shape(int r) {
             rollNo = r;/*ww w .  java  2s  .  c  om*/
     }
     int rollNo;
 }

public class Main {
     public  static void main(String[] args){
             HashSet<Shape> students = new HashSet<>();
             students.add(new Shape(5));
             students.add(new Shape(10));
             System.out.println(students.contains(new Shape(10)));
     }
 }
  • a) This program prints the following: true.
  • b) This program prints the following: false.
  • c) This program results in a compiler error.
  • d) This program throws NoSuchElementException.


b)

Note

Since methods equals() and hashcode() are not overridden for the Shape class, the contains() method will not work as intended and prints false.




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