50+ Software Developer fresher Interview Questions and Answers

Yes, Java allows implementing multiple interfaces in a single class.

• A class can implement multiple interfaces separated by a comma.

• All the methods of the implemented interfaces must be defined in the class.

• Example: class MyClass implements Interface1, Interface2 { }

Dynamic language is a programming language that executes at runtime and allows for flexibility in variable types.

• Variables do not need to be declared with a specific data type

• Examples include Python, Ruby, and JavaScript

• Statically typed languages require variable types to be declared before runtime

Normalization is the process of organizing data in a database to eliminate redundancy and improve data integrity.

• Normalization helps in reducing data redundancy by breaking down a large table into smaller, more manageable tables.

• It ensures that each piece of data is stored in only one place, reducing the chances of inconsistencies.

• Normalization follows a set of rules called normal forms, such as First Normal Form (1NF), Second Normal Form (2NF), etc.

• Each normal form has speci...read more

Constructor is used to initialize an object while method is used to perform a specific task.

• Constructor is called automatically when an object is created while method is called explicitly.

• Constructor has the same name as the class while method has a unique name.

• Constructor does not have a return type while method has a return type.

• Example of constructor: public class Person { public Person() { // constructor code } }

• Example of method: public void printName() { // method code ...read more

Java is a high-level, object-oriented programming language used for developing applications. It is case sensitive.

• Java is platform-independent and can run on any device with a Java Virtual Machine (JVM)

• Java is used for developing web, mobile, and desktop applications

• AWT (Abstract Window Toolkit) is a Java package used for creating graphical user interfaces (GUIs)

• MVC (Model-View-Controller) is a software design pattern used for separating an application's data, user interface,...read more

Java is a high-level programming language known for its platform independence and object-oriented programming features.

• Java is platform-independent due to its bytecode that can run on any machine with a Java Virtual Machine (JVM).

• Java is used for developing various applications such as web, mobile, desktop, and enterprise applications.

• Java provides automatic memory management through garbage collection.

• Java supports multithreading, which allows multiple threads to run concurr...read more

Code for Fibonacci series

• Use recursion or iteration to generate the series

• Start with 0 and 1, then add the previous two numbers to get the next

• Can be optimized using memoization or dynamic programming

Culture add interview questions are designed to assess a candidate's potential to contribute positively to the company culture.

• Ask about their hobbies and interests outside of work

• Inquire about their experience working in diverse teams

• Ask how they handle conflict and difficult situations

• Ask about their values and how they align with the company's values

• Ask about their communication style and how they collaborate with others

An interface is a contract that defines a set of methods and properties that a class must implement.

• An interface is a blueprint for a class.

• It contains only the method signatures and properties.

• It does not contain any implementation code.

• A class can implement multiple interfaces.

• Interfaces are used for achieving abstraction and polymorphism.

• Example: IDisposable interface in C#.

• Example: Runnable interface in Java.

final is a keyword used to declare a variable constant, finally is a block of code that executes after try-catch block, and finalize is a method called by garbage collector before destroying an object.

• final is used to declare a variable constant and cannot be changed later

• finally is a block of code that executes after try-catch block, regardless of whether an exception is thrown or not

• finalize is a method called by garbage collector before destroying an object, used to perfor...read more

HTML and Java are two different programming languages used for different purposes.

• HTML is used for creating web pages and defining their structure and content.

• Java is a general-purpose programming language used for developing applications and software.

• HTML is a markup language while Java is an object-oriented programming language.

• HTML is used for front-end development while Java is used for back-end development.

• HTML is not a programming language but a markup language used for...read more

Java is a high-level programming language known for its platform independence and object-oriented programming features.

• Java is an object-oriented programming language that follows the OOPS concepts.

• It is platform-independent, meaning it can run on any platform with a Java Virtual Machine (JVM).

• Java is known for its security features and is widely used for developing web and mobile applications.

• Some of the popular Java frameworks include Spring, Hibernate, and Struts.

• OOPS conc...read more

Python is a high-level programming language known for its simplicity and readability.

• Python is an interpreted language, which means it does not need to be compiled before running.

• It has a large standard library that provides many pre-built functions and modules.

• Python supports multiple programming paradigms, including procedural, object-oriented, and functional programming.

• Some of the keywords in Python include 'if', 'else', 'for', 'while', 'def', 'class', 'import', 'try', 'e...read more

C is a procedural language while Java is an object-oriented language.

• C is compiled while Java is interpreted.

• C has pointers while Java does not.

• Java has automatic garbage collection while C does not.

• Java has platform independence while C does not.

• Java has built-in exception handling while C does not.

Java is the most versatile and widely used language among the given options.

• Java is an object-oriented language with a vast library of pre-built classes and functions.

• It is used for developing desktop, web, and mobile applications.

• Java is highly scalable and secure, making it a popular choice for enterprise-level applications.

Multi-threading is a technique of executing multiple threads simultaneously in a single process.

• Multi-threading improves application performance by utilizing multiple CPUs or CPU cores.

• Each thread runs independently and shares the same memory space.

• Threads can communicate with each other through shared memory or message passing.

• Examples of multi-threaded applications include web servers, video games, and database systems.

A stack is a linear data structure that follows the Last In First Out (LIFO) principle.

• Elements are added to the top of the stack and removed from the top.

• Push() and pop() are the two main operations performed on a stack.

• Example program: Push 1, 2, 3 onto stack and pop them off in reverse order.

Java is a high-level, object-oriented programming language used for developing applications and software.

• Java is platform-independent and can run on any device with a Java Virtual Machine (JVM)

• It is known for its security features and is commonly used for developing web applications, mobile apps, and games

• Java code is compiled into bytecode which can be executed on any platform that has a JVM installed

• Java has a vast library of pre-built classes and APIs that make development...read more

To delete an element in a linked list, we need to find the node before the node to be deleted and update its next pointer.

• Find the node before the node to be deleted

• Update the next pointer of the previous node to point to the node after the node to be deleted

• Free the memory occupied by the node to be deleted

Program to find first letters in a sentence

• Split the sentence into words

• Get the first letter of each word

• Store the first letters in an array

Program to check if a given string is a palindrome or not

• Convert the string to lowercase to ignore case sensitivity

• Use two pointers, one at the start and one at the end of the string

• Compare the characters at both pointers and move them towards each other

• If all characters match, it is a palindrome

I know multiple programming languages.

• I am proficient in Java and Python.

• I have basic knowledge of C++ and JavaScript.

• I am currently learning Ruby and Swift.

The formula for power is P = W/t or P = F*v

• Power is the rate at which work is done or energy is transferred

• The unit of power is watt (W)

• P = W/t where W is work done and t is time taken

• P = F*v where F is force and v is velocity

• Power can be calculated for electrical circuits using P = VI or P = I^2*R

Software Development Life Cycle (SDLC) is a process followed by software development teams to design, develop and test high-quality software.

• SDLC consists of several phases including planning, analysis, design, development, testing, deployment, and maintenance.

• Each phase has its own set of activities and deliverables that must be completed before moving on to the next phase.

• SDLC models include Waterfall, Agile, and DevOps, each with its own approach to software development.

• SD...read more

Threads are lightweight processes that enable multitasking within a single process.

• Threads share the same memory space as the parent process.

• They can run concurrently and independently of each other.

• Threads can communicate with each other through shared memory or message passing.

• Examples of multithreaded applications include web servers and video games.

Answer to a Software Developer fresher's interview question on writing a Palindrome program and printing a star pattern.

• To write a Palindrome program, reverse the given string and compare it with the original string.

• To print a star pattern, use nested loops to print the required number of stars in each row.

• For example, to print a right triangle of stars with 5 rows, use two nested loops, one for rows and one for columns.

Opps concept and comparison between Java and Python

• OOPs concept is a programming paradigm that focuses on objects and their interactions

• Java is a statically typed language with strong OOPs support and is used for enterprise applications

• Python is a dynamically typed language with OOPs support and is used for scripting and data analysis

• Java has a larger community and is more suitable for large-scale projects

• Python has a simpler syntax and is more suitable for small-scale projec...read more

GUI stands for Graphical User Interface which is a visual way of interacting with a computer program.

• GUI allows users to interact with software through graphical elements such as icons, buttons, and menus.

• GUI design should be intuitive, user-friendly, and visually appealing.

• GUI can be created using various programming languages and frameworks such as JavaFX, Qt, and .NET.

• GUI can be customized to suit the needs of different users and applications.

• GUI can be used in various dev...read more

Yes, I am open to different shifts and locations.

• I am flexible and willing to work in any shift.

• I am open to relocation if required.

• I am excited to explore new opportunities and challenges.

• I am willing to adapt to the company's needs and requirements.

Top 5 booming technologies are AI, Blockchain, Cloud Computing, IoT, and Cybersecurity.

• AI - Artificial Intelligence is being used in various industries like healthcare, finance, and retail.

• Blockchain - It is used for secure and transparent transactions in industries like finance and supply chain management.

• Cloud Computing - It provides on-demand access to computing resources and is used by businesses of all sizes.

• IoT - Internet of Things is used in industries like manufacturi...read more

An array is a collection of similar data types. OOPs is a programming paradigm based on the concept of objects.

• Arrays are used to store multiple values in a single variable.

• In OOPs, objects are instances of classes that encapsulate data and behavior.

• Arrays can be one-dimensional, two-dimensional, or multi-dimensional.

• In OOPs, inheritance, polymorphism, and encapsulation are important concepts.

• Example: int[] numbers = {1, 2, 3, 4, 5};

• Example: class Car { String make; int year;...read more

Scanner class is used to read input from user or file

• Scanner class is part of java.util package

• It can read input from various sources like keyboard, file, etc.

• It can read different data types like int, double, string, etc.

• Arrays can be read using scanner class by iterating through each element

Inheritance is a mechanism in object-oriented programming where a new class is created by inheriting properties of an existing class.

• Inheritance allows code reusability and promotes a hierarchical relationship between classes.

• The existing class is called the superclass or parent class, and the new class is called the subclass or child class.

• The subclass inherits all the properties and methods of the superclass, and can also add new properties and methods or override existing ...read more

There are various types of coding such as procedural, object-oriented, functional, and declarative.

• Procedural coding involves writing a sequence of instructions to perform a task.

• Object-oriented coding involves creating objects that have properties and methods to perform tasks.

• Functional coding involves writing functions that take inputs and produce outputs without modifying the input data.

• Declarative coding involves specifying what needs to be done rather than how to do it.

• O...read more

Golden rules of accounting are basic principles to maintain financial records accurately.

• The first rule is the accounting equation: Assets = Liabilities + Equity

• The second rule is the revenue recognition principle: Record revenue when earned, not when received

• The third rule is the matching principle: Match expenses with the revenue they generate

• The fourth rule is the cost principle: Record assets at their original cost

• The fifth rule is the objectivity principle: Record transa...read more

The question is asking for a code that can determine whether a given number is even or odd.

• Use the modulo operator (%) to check if the number is divisible by 2

• If the result of the modulo operation is 0, the number is even

• If the result of the modulo operation is 1, the number is odd

My favorite dish is pizza.

• I love the combination of cheese, tomato sauce, and toppings on a crispy crust.

• My favorite toppings are pepperoni, mushrooms, and olives.

• I enjoy trying different types of pizza from different restaurants.

• I also like making my own pizza at home with fresh ingredients.

There is no one-size-fits-all answer to this question as it depends on the project requirements and team preferences.

• The coding language should be chosen based on the project requirements and constraints.

• Consider the team's expertise and familiarity with the language.

• Evaluate the language's performance, scalability, and maintainability.

• Some popular languages for software development are Java, Python, C++, and JavaScript.

Structures and unions are both used to group related data, but structures allocate memory for each member while unions share memory between members.

• Structures are used to group related data of different types, each member has its own memory allocation

• Unions are used to group related data of different types, but all members share the same memory allocation

• Structures are used when all members need to be accessed at the same time

• Unions are used when only one member needs to be a...read more

My BTech percentage is 75%

• I scored 75% in my BTech degree

• My academic performance was consistent throughout the course

• I have also completed various coding projects during my BTech program

Program to create an array of strings

• Declare an array variable with a specific size

• Assign values to each element of the array

• Access elements of the array using their index

• Example: String[] names = new String[5]; names[0] = "John"; names[1] = "Mary";

Current is the flow of electric charge through a conductor.

• Current is measured in amperes (A).

• It is caused by the movement of electrons.

• There are two types of current: direct current (DC) and alternating current (AC).

• DC flows in one direction while AC changes direction periodically.

• Current is essential for the functioning of electrical devices.

Developers and testers are equally important for ensuring the quality of software.

• Developers write the code and testers ensure that the code works as expected.

• Testers identify bugs and report them to developers for fixing.

• Developers and testers work together to ensure that the software meets the requirements and is of high quality.

• Without testers, bugs may go unnoticed and cause issues for end-users.

• Without developers, there would be no software to test.

• Collaboration between ...read more

Java is an object-oriented programming language used for developing applications and software.

• Java is platform-independent

• Java is statically-typed

• Java has automatic memory management

• Java supports multithreading

• Java has a vast standard library

• Java is used for developing web, mobile, and desktop applications

I completed my Bachelor's degree in Computer Science from XYZ College.

• Completed Bachelor's degree in Computer Science

• Studied at XYZ College

• Graduated in the year [year of graduation]

Java process waterfall model is a linear sequential approach to software development.

• It consists of distinct phases such as requirements gathering, design, implementation, testing, deployment, and maintenance.

• Each phase must be completed before moving on to the next one.

• It is a rigid and inflexible model that does not allow for changes once a phase is completed.

• It is suitable for projects with well-defined requirements and a stable scope.

• Example: Developing a banking applicat...read more

Pointers are variables that store memory addresses of other variables or functions.

• Pointers allow for dynamic memory allocation and manipulation.

• They can be used to pass values by reference instead of by value.

• Pointers can be used to create complex data structures like linked lists and trees.

• Examples of pointer types include int*, char*, and void*.

Hashtable and Hashmap are both implementations of Map interface in Java.

• Hashtable is synchronized while Hashmap is not.

• Hashtable does not allow null keys or values while Hashmap allows one null key and any number of null values.

• Hashtable is slower than Hashmap due to synchronization.

• Hashtable is thread-safe while Hashmap is not.

• Hashtable is considered legacy while Hashmap is the preferred implementation.