Programming In Java | Week 3
Session: JAN-APR 2024
Course name: Programming In Java
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These are NPTEL Programming In Java Week 3 Assignment 3 Answers
Q1. Which of the following statement is true regarding the order of execution of constructors in an inheritance hierarchy?
a. Base class constructor will be called followed by the derived class constructor.
b. Derived class constructor will be called followed by the base class constructor.
c. Only Base class constructor will be called.
d. Only derived class constructor will be called.
Answer: a. Base class constructor will be called followed by the derived class constructor.
Q2. The super() method is used to:
a. Call constructor of friend class
b. Is a declared method
c. Call constructor of the parent class
d. Call constructor
Answer: c. Call constructor of the parent class
Q3. What will be the output of the following Java program?
a. 0
b. 1
c. 2
d. Compilation Error
Answer: c. 2
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These are NPTEL Programming In Java Week 3 Assignment 3 Answers
Q4. In Java, is it possible to override a static method?
a. Yes, we can override a static method just like we do with instance methods.
b. No, static methods cannot be overridden because they belong to the class, not the object.
c. It depends on whether the static method is declared as final or not.
d. It depends on the access modifier of the static method.
Answer: b. No, static methods cannot be overridden because they belong to the class, not the object.
Q5. What is the output of the following Java program?
a. “The vehicle moves”
b. “The car moves”
c. The code does not compile
d. None of the above
Answer: b. “The car moves”
Q6. What is the output of the below Java program with inheritance?
a. Sweet=$10 Sugar=$20
b. Sweet=$10 Sugar=$10
c. Sweet=$20 Sugar=$20
d. Compiler error
Answer: a. Sweet=$10 Sugar=$20
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These are NPTEL Programming In Java Week 3 Assignment 3 Answers
Q7. What is the purpose of method hiding in Java inheritance?
a. To prevent a subclass from inheriting methods
b. To override superclass methods with new implementations
c. To expose private methods of the superclass
d. To define methods with the same name in both the superclass and subclass
Answer: d. To define methods with the same name in both the superclass and subclass
Q8. What is the output of the following Java program?
a. “parent from parent”
b. “child from child”
c. “parent from child”
d. “child from parent”
Answer: c. “parent from child”
Q9. Can a class be marked as both “final” and “abstract” in Java?
a. Yes, but only if it has no methods.
b. Yes, a class can be marked as both “final” and “abstract.”
c. No, a class cannot be both “final” and “abstract.”
d. Yes, but only if it is marked as “protected.”
Answer: c. No, a class cannot be both “final” and “abstract.”
Q10. In Java, is it possible to override a static method?
a. Yes, we can override a static method just like we do with instance methods.
b. No, static methods cannot be overridden because they belong to the class, not the object.
c. It depends on whether the static method is declared as final or not.
d. It depends on the access modifier of the static method.
Answer: b. No, static methods cannot be overridden because they belong to the class, not the object.
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These are NPTEL Programming In Java Week 3 Assignment 3 Answers
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Session: JULY-DEC 2023
Course Name: Programming In Java
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These are NPTEL Programming In Java Week 3 Assignment 3 Answers
Programming Assignment
Question 1
This program is related to the generation of Fibonacci numbers.
For example: 0,1, 1,2, 3,5, 8, 13,… is a Fibonacci sequence where 13 is the 8th Fibonacci number.
A partial code is given and you have to complete the code as per the instruction given .
Solution:
if (n==1)
return 0;
else if(n==2)
return 1;
return fib(n - 1) + fib(n - 2);Question 2
Define a class Point with two fields x and y each of type double. Also, define a method distance(Point p1, Point p2) to calculate the distance between points p1 and p2 and return the value in double.
Solution:
class Point{
double x;
double y;
public static void distance(Point p1,Point p2)
{
double d;
d=Math.sqrt((p2.x-p1.x)*(p2.x-p1.x) + (p2.y-p1.y)*(p2.y-p1.y));
System.out.print(d);
}
}These are NPTEL Programming In Java Week 3 Assignment 3 Answers
Question 3
A class Shape is defined with two overloading constructors in it. Another class Test1 is partially defined which inherits the class Shape. The class Test1 should include two overloading constructors as appropriate for some object instantiation shown in main() method. You should define the constructors using the super class constructors. Also, override the method calculate( ) in Test1 to calculate the volume of a Shape.
Solution:
double height;
Test1(double length, double h) {
super(length);
height=h;
}
Test1(double length, double breadth, double h) {
super(length,breadth);
height=h;
}
double calculate() {
return length*breadth*height;
}Question 4
This program to exercise the call of static and non-static methods. A partial code is given defining two methods, namely sum( ) and multiply ( ). You have to call these methods to find the sum and product of two numbers. Complete the code segment as instructed.
Solution:
QuestionScope st = new QuestionScope();
int result1 = st.sum(n1,n2);
int result2 = QuestionScope.multiply(n1,n2);
System.out.println(result1);
System.out.print(result2);These are NPTEL Programming In Java Week 3 Assignment 3 Answers
Question 5
Complete the code segment to swap two numbers using call by object reference.
Solution:
public static void swap(Question t)
{
int temp = t.e1;
t.e1 = t.e2;
t.e2 = temp;
}These are NPTEL Programming In Java Week 3 Assignment 3 Answers
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Session: JAN-APR 2023
Course Name: Programming in Java
Course Link: Click Here
These are NPTEL Programming In Java Week 3 Assignment 3 Answers
Q1. Which of the following statement(s) is/are correct about the constructor?
a. Constructors cannot be synchronized in Java.
b. Java does not provide a default copy constructor.
c. A constructor cannot be overloaded.
d. “this” or “super” can be used in a constructor.
Answer: a, b, d
Q2. Which of the following statement(s) is/are true?
a. You can write a new instance method in the subclass with the same signature as the one in the superclass, thus overriding it.
b. You can write a new static method in the subclass with the same signature as the one in the superclass, thus hiding it.
c. A subclass inherits all of its parent’s public and protected members, no matter what package the subclass is in.
d. You cannot declare new methods in the subclass that are not in the superclass.
Answer: a, b, c
These are NPTEL Programming In Java Week 3 Assignment 3 Answers
Q3. Consider the following piece of code.
Fill in the blank with the appropriate keyword(s) from the list given below so that the program compiles successfully.
a. abstract
b. final
c. default
d. public
Answer: b, d
Q4. How many instances of abstract class can be created?
a. 0
b. 1
c. 2
d. Multiple
Answer: a. 0
These are NPTEL Programming In Java Week 3 Assignment 3 Answers
Q5. Structuring a Java class such that only methods within the class can access its instance variables is referred to as ______.
a. object orientation
b. inheritance
c. platform independence
d. encapsulation
Answer: d. encapsulation
Q6. Which of the following statement(s) is/are true?
a. A final method cannot be overridden in a subclass.
b. The advantage of private static methods is that they can be reused later if you need to reinitialize the class variable.
c. Class methods cannot use this keyword as there is no instance for this to refer to.
d. A final method can be overridden in a subclass.
Answer: a, b, c
These are NPTEL Programming In Java Week 3 Assignment 3 Answers
Q7. Consider the following piece of code.
Which of the following is the output of the above program?
a. Java
b. There will be a compile-time error.
c. JavaJava.
d. The program will give a runtime error.
Answer: b. There will be a compile-time error.
Q9. Consider the following program.
What is the output of the above program?
a. java
b. ring
c. r min
d. gram
Answer: b. ring
These are NPTEL Programming In Java Week 3 Assignment 3 Answers
Q9. Which of the following statement(s) is/are False?
a. Hiding internal data from the outside world and accessing it only through publicly exposed methods is known as data encapsulation.
b. Common behavior can be defined in a superclass and inherited into a subclass using the extends keyword.
c. The term “class variable” is another name for a non-static field.
d. A local variable stores a temporary state; it is declared inside a method.
Answer: c. The term “class variable” is another name for a non-static field.
Q10. Which of the following statement(s) is/are true?
a. Static methods in interfaces are never inherited.
b. You will get a compile-time error if you attempt to change an instance method in the superclass to a static method in the subclass.
c. You can prevent a class from being subclassed by using the final keyword in the class’s declaration.
d. An abstract class can only be subclassed; it cannot be instantiated.
Answer: a, b, c, d
These are NPTEL Programming In Java Week 3 Assignment 3 Answers
Programming In Java Programming Assignment Solution
Question 1
Define a class Point with two fields x and y each of type double. Also, define a method distance(Point p1, Point p2) to calculate the distance between points p1 and p2 and return the value in double.
Complete the code segment given below. Use Math.sqrt( ) to calculate the square root.
Solution:
//CodeThese are NPTEL Programming In Java Week 3 Assignment 3 Answers
Question 2
This program to exercise the call of static and non-static methods. A partial code is given defining two methods, namely sum( ) and multiply ( ). You have to call these methods to find the sum and product of two numbers. Complete the code segment as instructed.
Solution:
//CodeThese are NPTEL Programming In Java Week 3 Assignment 3 Answers
Question 3
Complete the code segment to swap two numbers using call by object reference.
Solution:
//CodeThese are NPTEL Programming In Java Week 3 Assignment 3 Answers
Question 4
This program is related to the generation of Fibonacci numbers.>
For example: 0,1, 1,2, 3,5, 8, 13,… is a Fibonacci sequence where 13 is the 8th Fibonacci number.
A partial code is given and you have to complete the code as per the instruction given .
Solution:
//CodeThese are NPTEL Programming In Java Week 3 Assignment 3 Answers
Question 5
A class Shape is defined with two overloading constructors in it. Another class Test1 is partially defined which inherits the class Shape. The class Test1 should include two overloading constructors as appropriate for some object instantiation shown in main() method. You should define the constructors using the super class constructors. Also, override the method calculate( ) in Test1 to calculate the volume of a Shape.
Solution:
//CodeThese are NPTEL Programming In Java Week 3 Assignment 3 Answers
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Session: JULY-DEC 2022
Course Name: Programming in Java NPTEL
These are NPTEL Programming In Java Week 3 Assignment 3 Answers
Q1. Which of this keyword can be used in a sub class to call the constructor of super class?
a. super
b. this
c. extent
d. extends
Answer: a. super
Q2. What is the output of the above program?
a. i+jis 42 4
b. i+jis6 9 2
c. i+jis 42 9 2
d. i+jis 6 4
Answer: a. i+jis 42 4
Q3. What is the output of the above program?
a. 4
b. 10
c. 2
d. runtime error
Answer: c. 2
These are NPTEL Programming In Java Week 3 Assignment 3 Answers
Q4. For each description on the left, find the best matching modifier on the right. You may use a choice more than once or not at all.
a. 1-A, 2-A, 3-C, 4-D, 5-E
b. 1-A, 2-A, 3-A, 4-B, 5-C
c. 1-C, 2-B, 3-A, 4-A, 5-D
d. None of Above
Answer: b. 1-A, 2-A, 3-A, 4-B, 5-C
Q5. All the variables of interface should be?
a) default and final
b) default and static
c) public, static and final
d) protect, static and final
Answer: c) public, static and final
Q6. Which of the following statement(s) is/are NOT true?
a. A final method cannot be overridden in a subclass.
b. The advantage of private static methods is that they can be reused later if you need to reinitialize the class variable.
c. Class methods cannot use this keyword as there is no instance for this to refer to.
d. A final method can be overidden in a subclass.
Answer: d. A final method can be overidden in a subclass.
These are NPTEL Programming In Java Week 3 Assignment 3 Answers
Q7. Which of the following statements is/ are true?
a. Hello
b. There will be a compile-time error
c. HelloHello.
d. The program will give a runtime error.
Answer: d. The program will give a runtime error.
Q8. Which of the following option is true about the above program?
a. Eror: String cannot be a method return tpe like void, int, char, etc.; as it isa class.
b. Eror: Non-static variable ‘answer’ cannot be referenced from a static context.
c. Output: The answer to the question, Which course have you opted? is Programming with Java
d. Error: Compilation error as variable question’ is not static.
Answer: c. Output: The answer to the question, Which course have you opted? is Programming with Java
Q9. Disadvantage(s) of inheritance in Java programming is/are
a. Code readability
b. two classes (base and inherited class) get tightly coupled
c. Save development time and effort
d. Code reusability
Answer: b. two classes (base and inherited class) get tightly coupled
These are NPTEL Programming In Java Week 3 Assignment 3 Answers
Q10. Which inheritance in Java programming is not supported?
a. Multiple inheritance using classes.
b. Multiple inheritance using interfaces.
c. Multilevel inheritance.
d. Single inheritance.
Answer: a. Multiple inheritance using classes.
These are NPTEL Programming In Java Week 3 Assignment 3 Answers
Programming Assignment Solutions
Question 1
This program is related to the generation of Fibonacci numbers. For example: 0,1, 1,2, 3,5, 8, 13,… is a Fibonacci sequence where 13 is the 8th Fibonacci number. A partial code is given and you have to complete the code as per the instruction given below.
Solution:
//CodeThese are NPTEL Programming In Java Week 3 Assignment 3 Answers
Question 2
Define a class Point with two fields x and y each of type double. Also, define a method distance(Point p1, Point p2) to calculate the distance between points p1 and p2 and return the value in double.
Solution:
//CodeThese are NPTEL Programming In Java Week 3 Assignment 3 Answers
Question 3
A class Shape is defined with two overloading constructors in it. Another class Test1 is partially defined which inherits the class Shape. The class Test1 should include two overloading constructors as appropriate for some object instantiation shown in main() method. You should define the constructors using the super class constructors. Also, override the method calculate( ) in Test1 to calculate the volume of a Shape.
Solution:
//CodeThese are NPTEL Programming In Java Week 3 Assignment 3 Answers
Question 4
This program to exercise the call of static and non-static methods. A partial code is given defining two methods, namely sum( ) and multiply ( ). You have to call these methods to find the sum and product of two numbers. Complete the code segment as instructed.
Solution:
//CodeThese are NPTEL Programming In Java Week 3 Assignment 3 Answers
Question 5
Complete the code segment to swap two numbers using call by object reference.
Solution:
//CodeThese are NPTEL Programming In Java Week 3 Assignment 3 Answers
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