Java OCA OCP Practice Question 3031

Question

Given the class definition: 

class Student{
       public Student(int r) {
               rollNo = r;
       }
       int rollNo;
}

Choose the correct option based on this code segment: 

HashSet<Student> students = new HashSet<>();
students.add(new Student(5));
students.add(new Student(10));
System.out.println(students.contains(new Student(10)));
  • a) this program prints the following: true
  • b) this program prints the following: false
  • c) this program results in compiler error(s)
  • d) this program throws NoSuchElementException


b)

Note

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




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