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Computer Applications

Consider the following Java class and answer the questions given below:

class Student
{
  String name;
  int age;

  Student(String n, int a)
  {
    name = n;
    age = a;
  }

  void display()
  {
    System.out.println("Name: " + name + ", Age: " + age);
  }

  public static void main(String[] args)
  {
    Student s1 = new Student("John", 15);
    Student s2 = new Student();
    s1.display();
    s2.display();
  }
}

(a) Will this program compile successfully? If not, explain the error.

(b) How can this program be modified to work correctly?

Java Constructors

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Answer

(a) No, it will not compile because the class does not have a default constructor.
(b) To fix the issue, a default constructor must be added.

Reason — The given Java program will not compile successfully because the Student class has a parameterized constructor but does not have a default constructor. In the main method, an object s2 is being created using new Student();, which tries to call a default constructor. Since no default constructor is explicitly defined, and Java does not provide one when a parameterized constructor is present, this results in a compilation error.

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