Logixal Solutions Java Developer Interview Questions and Answers

1 hr test on testing basics

Q1. What is test bed
Ans. 
A test bed is a platform or environment where testing is conducted to evaluate the performance of software or hardware.
• Test bed is used to simulate real-world conditions for testing purposes.

• It allows testers to identify and fix issues before the product is released to the market.

• Examples of test beds include virtual machines, physical devices, and cloud-based testing environments.
Answered by AI
Add your answer
Q2. What is test case
Add your answer

Q1. Package discussion
Add your answer

Q1. What are oops concepts in java, explain real time scenario
Ans. 
OOPs concepts in Java include inheritance, polymorphism, encapsulation, and abstraction.
• Inheritance allows a subclass to inherit properties and methods from a superclass.

• Polymorphism allows objects to take on multiple forms and behave differently based on their context.

• Encapsulation hides the implementation details of an object and only exposes necessary information.

• Abstraction allows for the creation of abstract class...read more
Answered by AI
View 1 more answer
Q2. Uses of interface, inheritance
Ans. 
Interfaces define contracts for behavior, while inheritance allows for code reuse and polymorphism.
• Interfaces allow for loose coupling and abstraction, enabling multiple implementations of the same behavior.

• Inheritance allows for code reuse and extension of existing classes, reducing code duplication.

• Polymorphism allows objects of different classes to be treated as if they were of the same class, simplifying code and i...read more
Answered by AI
Add your answer
Q3. SQL query for join of tables
Ans. 
SQL query for joining tables
• Use JOIN keyword to combine two or more tables based on a related column

• Specify the columns to be selected using SELECT keyword

• Use ON keyword to specify the condition for joining the tables

• Different types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN
Answered by AI
Add your answer
Q4. Java concepts used in your project
Ans. 
Used Java concepts such as inheritance, polymorphism, and exception handling in my project.
• Implemented inheritance to create a base class and derived classes with specific functionalities.

• Utilized polymorphism to allow objects of different classes to be treated as if they were of the same class.

• Implemented exception handling to handle errors and prevent program crashes.

• Used interfaces to define a set of methods that a ...read more
Answered by AI
Add your answer
Q5. Overloading vs overriding, practical uses
Ans. 
Overloading is having multiple methods with the same name but different parameters. Overriding is having a method in a subclass with the same name and parameters as a method in the superclass.
• Overloading is used to provide different ways to call a method with different parameters

• Overriding is used to provide a specific implementation of a method in a subclass

• Overloading is resolved at compile-time while overriding is r...read more
Answered by AI
Add your answer

Q1. Map reduce filter in javascript
Ans. 
Map, reduce, and filter are higher-order functions in JavaScript used to manipulate arrays.
• Map: Transforms each element in an array and returns a new array with the transformed elements.

• Reduce: Reduces an array to a single value by applying a function to each element.

• Filter: Creates a new array with elements that pass a certain condition.
Answered by AI
Add your answer
Q2. Exception handling
Add your answer

Q1. Linked list question to detect cycle
Ans. 
Detecting a cycle in a linked list using Floyd's Tortoise and Hare algorithm.
• Use two pointers: slow and fast. Slow moves one step, fast moves two steps.

• If there's a cycle, slow and fast will eventually meet.

• If fast reaches the end (null), there's no cycle.

• Example: In a list 1 -> 2 -> 3 -> 4 -> 2 (cycle), slow and fast meet at 2.
Answered by AI
Add your answer
Q2. Basic questions from JS
Add your answer

Q1. Some questions related to my projects
Add your answer
Q2. Some Questions related to my past experience
Add your answer

Q1. What is interface ?
Ans. 
An interface in software development defines a contract for classes to implement, specifying methods and properties.
• Interfaces in programming languages like Java and C# allow for multiple inheritance by defining a set of methods that a class must implement.

• Interfaces provide a way to achieve abstraction and polymorphism in object-oriented programming.

• Interfaces are used to define common behavior that multiple classes c...read more
Answered by AI
Add your answer
Q2. Hat is encapsulation
Ans. 
Encapsulation is the concept of bundling data and methods that operate on the data into a single unit.
• 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 direct access from outside the class.

• Encapsulation promotes code reusability and makes the code easier to maintain.

• Example: In a class representing a car, the variables lik...read more
Answered by AI
Add your answer

10 apti questions and 10 technical mcq on cpp

Q1. Oops concept question
Add your answer
Q2. Sql queries on join
Add your answer

Oops topic and aptitude