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Programming In Java

Nptel Programming in Java Week 5 Assignment Answers

Q1. Which of the following statement(s) is/are true about finally in Java?

I. The finally block is executed regardless of whether an exception is thrown or not.
II. A finally block can exist without a catch block.
III. The finally block will not execute if System.exit() is called in the try block.
IV. A finally block can have a return statement, but it is not recommended to use.

a) I and II
b) II and III
c) I, III, and II
d) I, II, III, and IV

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Q2. What will be the output of the following Java program?

interface A {
    int x = 10;
    void display();
}
class B implements A {
    public void display() {
        System.out.println("Value of x: " + x);
    }
}
public class Main {
    public static void main(String[] args) {
        B obj = new B();
        obj.display();
    }
}

a) Value of x: 10
b) Value of x: 0
c) Compilation Error
d) Runtime Error

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

class NPTEL {
    public static void main(String[] args) {
        try {
            int a = 5;
            int b = 0;
            System.out.println(a / b);
        } catch (ArithmeticException e) {
            System.out.print("Error ");
        } finally {
            System.out.print("Complete");
        }
    }
}

a) 5 Complete
b) Error Complete
c) Runtime Error
d) Compilation Error

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Q4. Which of the following is TRUE regarding abstract classes and interfaces in Java?

I. Abstract classes can contain constructors, but interfaces cannot.
II. Interfaces support multiple inheritance, but abstract classes do not.
III. Abstract classes can have both abstract and concrete methods, whereas interfaces only had abstract methods before Java 8.

a) I, II, and III
b) II only
c) I and II only
d) II and III only

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Q5. Which of the following is a checked exception in Java?

a) NullPointerException
b) ArrayIndexOutOfBoundsException
c) IOException
d) ArithmeticException

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Q6. Which keyword is NOT used by Java during exception handling?

a) try
b) catch
c) final
d) finally

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Q7. What is the purpose of the throws keyword in Java?

a) To declare exceptions that a method can throw
b) To throw an exception immediately
c) To catch an exception
d) It is not a keyword in Java

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Q8. Which of the following is TRUE about interfaces in Java?

a) Interfaces should always be defined as final
b) Interfaces can be instantiated directly.
c) Interfaces can extend multiple interfaces.
d) Interfaces cannot have any method signatures.

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Q9. What will be the output of the following code?

interface Demo {
    void display();
}
class Test implements Demo {
    public void display() {
        System.out.println("Hello, NPTEL!");
    }
}
public class Main {
    public static void main(String[] args) {
        Test obj = new Test();
        obj.display();
    }
}

a) Hello, NPTEL!
b) Compilation Error
c) Runtime Error
d) No Output

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Q10. What will be the output of the following Java program?

interface Calculator {
    void calculate(int value);
}
class Square implements Calculator {
    int result;
    public void calculate(int value) {
        result = value * value;
        System.out.print("Square: " + result + " ");
    }
}
class Cube extends Square {
    public void calculate(int value) {
        result = value * value * value;
        super.calculate(value);
        System.out.print("Cube: " + result + " ");
    }
}
public class Main {
    public static void main(String[] args) {
        Calculator obj = new Cube();
        obj.calculate(3);
    }
}

a) Square: 9 Cube: 9
b) Cube: 27 Square: 9
c) Square: 9 Square: 27 Cube: 27
d) Square: 9 Cube: 27 Square: 27

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