Data Structure And Algorithms Using Java Assignment 1 Answers 2023

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NPTEL Data Structure And Algorithms Using Java Week 1 Assignment Answers 2023

1. What is “generic programming” in Java?

a. A programming paradigm that focuses on reusability and type safety.
b. A technique to optimize code execution in Java programs.
c. A feature to dynamically modify variable types at runtime.
d. A method to generate random data in Java programs.

Answer :- a. A programming paradigm that focuses on reusability and type safety.

"Generic programming" in Java refers to the use of generics, a programming feature introduced in Java 5 (J2SE 5.0). Generics allow classes, interfaces, and methods to be parameterized with types. By using generics, you can create classes and methods that can work with different types while ensuring type safety. This helps to improve code reusability and maintainability by writing more generic and flexible components.

2. Which symbol is used to denote a generic type in Java?

a. *
b. &
c. #
d. <>

Answer :- d. <>

The symbol used to denote a generic type in Java is <>. It is referred to as the diamond operator or angle brackets. Generics in Java allow you to create classes, interfaces, and methods that can work with different types while providing type safety. The diamond operator is used when defining a generic class or when instantiating an object of a generic class to specify the type parameter.

3. Consider the following piece of code.

Which of the following is true?

a. The code suffers from syntax errors.
b. Program will give a compile-time error.
c. It will produce output: 5 4 3 2 1
d. Program will yield a run-time error.

Answer :- c. It will produce output: 5 4 3 2 1

The code is correct syntactically and will execute without any compilation errors or runtime errors. It starts the loop with i initialized to 5, and then decrements i in each iteration until it becomes 0 (excluding 0). Therefore, it will print the numbers 5, 4, 3, 2, and 1, each on a separate line.

4. What will be the output of the following code snippet?

a. Compile-time eifor
b. 9 5 47
c. Run-time error
d. 9 5 4 7

Answer :- d. 9 5 4 7

5.Which of these is wildcard symbol?

a. ?
b. !
C. &
d. %

Answer :- a. Compile-time eifor

The option "Compile-time eifor" suggests that there is a typo in the code, and there may be a misspelling of the for keyword. If the code snippet contains "eifor" instead of "for," it will result in a compilation error.

6. Which of the following keywords is used to declare an upper bounded wildcard?

a. bound
b. extends
c. implement
d. super

Answer :- b. extends

In Java, the keyword "extends" is used to declare an upper bounded wildcard when working with generics. An upper bounded wildcard restricts the type that can be used as a parameter to a specific class or its subclasses.

7. Can primitive types be used as type arguments in Java generics?

a. Yes, any primitive type can be used.
b. No. only reference types are allowed as type arguments.
c. Yes, but they need to be wrapped in their corresponding wrapper classes.
d. No, primitive types are not compatible with Java generics.

Answer :- c. Yes, but they need to be wrapped in their corresponding wrapper classes. 

8. What is type erasure in Java generics?

a. The process of automatically converting generic types to their raw types during compilation.
b. The ability to perform runtime type checking of generic types.
c. The process of inferring type arguments based on method calls.
d. The feature that allows dynamic dispatch of the generic method.

Answer :- a. The process of automatically converting generic types to their raw types during compilation.

Type erasure in Java generics is the process by which the compiler removes or "erases" the type parameters used in generic code during compilation. This means that the generic type information is not retained at runtime. Instead, the generic types are replaced with their raw types (non-generic types), which are used for compatibility with pre-generic Java code.

9. Which of the following statements) is(are) true with respect to the use of generics?

a. The Java compiler enforces tighter type checks on generic code at compile time.
b. Generics support programming types as parameters.
c. Generics enable you to implement generic algorithms.
d. In case of a generic method, the same code can work for different types of data.

Answer :- a. The Java compiler enforces tighter type checks on generic code at compile time. 
b. Generics support programming types as parameters.
c. Generics enable you to implement generic algorithms.
d. In the case of a generic method, the same code can work for different types of data.

10.

Which of the following statements about the code snippet is correct?

a. The code will compile and execute without any error.
b. code will compile but throw a runtime exception.
c. The code will not compile due to a type mismatch error
d. The code will not compile due to a missing implementation error.

Answer :- c. The code will not compile due to a type mismatch error 

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NPTEL Data Structure And Algorithms Using Java Assignment 1 Answers

1. Which feature can be implemented using encapsulation?

a. Inheritance
b. Abstraction
c. Polymorphism
d. Overloading

Answer:- b

2. Which of the following best describes encapsulation?

a. It is a way of combining various data members into a single unit.
b. It is a way of combining various member functions into a single unit.
C. It is a way of combining various data members and member functions into a single unit which can operate on any data.
d. It is a way of combining various data members and member functions that operate on those data members into a single unit.

Answer:- d

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3. Which of the followving should be encapsulated?

a. The data which is prone to change is near future.
b. The data prone to change in long terms.
c. The data which is intended to be changed.
d. d. The data which belongs to some other class.

Answer:- a

4. What will be the output?

import java.1o.*
class Q
public static void swap(int x, int y)
int temp;
temp = x
y=X
y= temp;
System.out.print(x+" " + y);
public statie void main(String[] args)
intx = 100;
int y= 10;
Swap(x, y);

• a. 100 10
• b. 10 100
• c. 10 10
• d. 100 100

Answer:- d

5. Why are generics used?

a. Generics make code more fast.
b. Generics make code more optimized and readable.
c. Generncs add stability to your code by making more of your bugs detectable at compile time.
d. Generics add stability to your code by making more of your bugs detectable at a runtime.

Answer:- c

6. Which of the following is true?

a. Generic programming and function overloading are very similar to each other.
b. With method overloading you can pass any type of data argument but with generic programming it is limited.
c. For generic programming to work, multiple functions of the same logic need to be created for different data types.
d. Method overriding is a fancy name for method overloading.

Answer:- a

👇For Week 02 Assignment Answers👇

7. Fill in the missing blank to implement it as a generic program?

class DemoClass<T>{
void genericPrint(
System.out.println(t);
public static void main (String[] args) {
DemoClass obj = new DemoClass0;
obj.genericPrint("HT");
obj genericPrint(1000)

• a. intt
• b. floatt
• c. double t
• d. T t

Answer:- d

8. How do we implement variable sized arguments in generic programming?

a. Aray
b. Variable argument
c. varars
d. getch

Answer:- a

9. T extends superclass> is used to implement which of the following?

a. Lower bound
b. Upper bound
c. Middle bound
d. None of the above.

Answer:- b

10. Why do we need to study data structures?

a. Because it’s a really hot topic in this era, like Machine Learning, Deep Learning.
b. Because it’s an ancient topic and we should know the history of computers
c. It is essential for developing a large, complex and critical software.
d. Data structures help us organize and access different types of data in the most efficient format according to our needs.

Answer:- c, d

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About Data Structure And Algorithms Using Java

With the growth of Information and Communication Technology, there is a need to develop large and complex software. For developing large software, software developers should have enough proficiency of data structures and algorithms. Further, those software should be platform independent, Internet enabled, easy to modify, secure, and robust. To meet this requirement object-oriented paradigm has been developed and based on this paradigm the Java programming language emerges as the best programming environment.

Now, Java programming language is being used for mobile programming, Internet programming, and many other applications compatible to distributed systems. This course aims to cover the essential topics of data structures and algorithms and how the same can be implemented using Java programming language. The participants of the proposed course will be able to improve their skills, to cope with the current demand of IT industries and solve many problems in their own filed of studies.

COURSE LAYOUT

• Week 1: 1D array, list and vector, 2D matrices and tables of objects
• Week 2: Java implementation of 1D and 2D arrays and its operations
• Week 3: Linked lists and its various operations, stack and queue
• Week 4: Java implementation of linked lists, stack and queue
• Week 5: Binary trees: Representation and operations. Variations of binary tree: Binary search tree, Height balanced search tree, Heap tree
• Week 6: Java implementation of binary trees and its variations
• Week 7: Graph : Structure, representation and operations
• Week 8: Java implementations of graph data structures
• Week 9: Algorithms (Part-I): Searching and sorting algorithms
• Week 10:Java implementation of Part-I algorithms
• Week 11:Algorithms (Part-II): Greedy algorithms, shortest path algorithms
• Week 12:Java implementation of Part-II algorithms

CRITERIA TO GET A CERTIFICATE

Average assignment score = 25% of average of best 8 assignments out of the total 12 assignments given in the course.
Exam score = 75% of the proctored certification exam score out of 100

Final score = Average assignment score + Exam score

YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF AVERAGE ASSIGNMENT SCORE >=10/25 AND EXAM SCORE >= 30/75. If one of the 2 criteria is not met, you will not get the certificate even if the Final score >= 40/100.