Junior Software Engineer Trainee

Junior Software Engineer Trainee Interview Questions and Answers

Updated 6 Feb 2025
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Q1. What is java What is class and object What is abstraction What is inheritance What is polymorphism What is method overloading and overriding What is construct

Ans.

Java is a popular programming language used for developing various applications.

  • Class is a blueprint for creating objects, which are instances of classes.

  • Abstraction is the concept of hiding implementation details and showing only necessary features.

  • Inheritance allows a class to inherit properties and behavior from another class.

  • Polymorphism allows objects of different classes to be treated as objects of a common superclass.

  • Method overloading is having multiple methods in the...read more

Q2. How good in Coding Knowledge in SQL query

Ans.

I have a strong understanding of SQL queries and can write complex queries efficiently.

  • Proficient in writing SQL queries to retrieve, update, and manipulate data

  • Familiar with joins, subqueries, indexes, and stored procedures

  • Experience optimizing queries for performance

  • Knowledge of database normalization and data modeling

  • Example: SELECT * FROM table WHERE condition;

Junior Software Engineer Trainee Interview Questions and Answers for Freshers

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Q3. Find the time complexity of binary search of given numbers

Ans.

Binary search has a time complexity of O(log n) where n is the number of elements in the array.

  • Time complexity is O(log n) as it divides the array in half at each step

  • Best case is O(1) when the element is found at the middle of the array

  • Worst case is O(log n) when the element is not present in the array

Q4. What is Oops? and what is inheritance

Ans.

Oops stands for Object-Oriented Programming. Inheritance is a mechanism in which a new class inherits properties and behaviors from an existing class.

  • Oops stands for Object-Oriented Programming

  • Inheritance allows a new class to inherit properties and behaviors from an existing class

  • Inheritance promotes code reusability and helps in creating a hierarchical relationship between classes

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Q5. What is key and explain its type

Ans.

A key is a unique identifier used to access or retrieve data in a data structure.

  • A key is used in key-value pairs to uniquely identify the value associated with it.

  • Keys are commonly used in dictionaries, hash tables, and databases.

  • Examples of keys include employee IDs, product codes, and usernames.

Q6. What is encapsulation in dot net

Ans.

Encapsulation in .NET is the concept of bundling data and methods that operate on the data into a single unit, known as a class.

  • Encapsulation helps in hiding the internal state of an object and restricting access to it.

  • It allows for better control over the data by preventing outside code from directly accessing or modifying it.

  • Access to the data is provided through methods, which can enforce validation rules or perform additional logic.

  • For example, a class representing a bank...read more

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Q7. Oops in python and different concepts in oops

Ans.

Object-oriented programming (OOP) in Python involves concepts like classes, objects, inheritance, polymorphism, and encapsulation.

  • Classes are blueprints for creating objects with attributes and methods.

  • Objects are instances of classes that can store data and perform actions.

  • Inheritance allows a class to inherit attributes and methods from another class.

  • Polymorphism enables objects to be treated as instances of their parent class.

  • Encapsulation restricts access to certain compo...read more

Q8. Joins to table and fetch data

Ans.

Joins are used to combine rows from two or more tables based on a related column between them.

  • Use JOIN keyword to combine tables based on a related column

  • Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

  • Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column

Q9. Why do you choose software

Ans.

I choose software because of my passion for problem-solving and creating innovative solutions.

  • Passion for problem-solving

  • Interest in creating innovative solutions

  • Opportunity for continuous learning and growth

  • Desire to work in a dynamic and fast-paced industry

Q10. What is the opps

Ans.

Object-oriented programming (OOP) is a programming paradigm based on the concept of objects, which can contain data in the form of fields (attributes) and code in the form of procedures (methods).

  • OOP focuses on creating reusable code by organizing data and behavior into objects.

  • Key principles of OOP include encapsulation, inheritance, and polymorphism.

  • Examples of OOP languages include Java, C++, and Python.

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