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Programming In Java

Nptel Programming in Java Week 4 Assignment Answers

1. 1. Q1. Which access modifier allows a method to be accessible within the same package but not from outside the package?

      a) default
      b) private
      c) public
      d) protected

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      Q2. What will happen if you attempt to access a private method from another class in Java?

      a) The method will be accessible.
      b) The method will throw an exception.
      c) The method will be inaccessible.
      d) The method will be converted to protected.

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      Q3. What will be the output of the following code?

      class Person {
          public Person() {
              System.out.println(a + b + " Java");
          }
      }
      class Employee extends Person {
          public Employee() {
              System.out.println(a * b + " Java");
          }
      }
      public class Question {
          public static void main(String args[]) {
              Person p = new Employee();
          }
      }
      

      a) 1Java 10Java
      b) 1Java 0Java
      c) 10Java 0Java
      d) 1Java1 0Java0

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      Q4. Which of the following is a built-in Java package?

      a) java.util
      b) my.package.util
      c) default.package
      d) system.java

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      Q5. What keyword is used to define a package in Java?

      a) define
      b) package
      c) import
      d) namespace

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      Q6. How do you import a specific class from a package in Java?

      a) import package.*;
      b) import package.ClassName;
      c) include package.ClassName;
      d) use package.ClassName;

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      Q7. Consider the following program:

      class Base {
          public void print() {
              System.out.println("Base class...");
          }
      }
      class Derived extends Base {
          public void print() {
              System.out.println("Derived class...");
          }
      }
      public class Main {
          private static void main(String[] args) {
              Base b = new Base();
              b.print();
              Derived d = new Derived();
              d.print();
          }
      }
      

      How many errors does this program contain?

      a) None
      b) 1
      c) 2
      d) 3

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      Q8. Which of the following is true about Java interfaces?

      a) They cannot contain method implementations.
      b) An interface can extend multiple classes.
      c) An interface can only contain abstract methods.
      d) They allow a class to achieve multiple inheritance.

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      Q9. What will happen if you do not specify an access modifier for a class in a package?

      a) The class will be ‘private’ by default.
      b) The class will be ‘protected’ by default.
      c) The class will be accessible only within the same package.
      d) The class will be ‘public’ by default.

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      Q10. Which access modifier provides the most restrictive access in Java?

      a) default
      b) protected
      c) private
      d) public

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