Persistent Systems Software Engineer Trainee Interview Questions and Answers

Q1. How to reverse a array, basic java
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Q1. Oops concepts to be known
Ans. 
Understanding of OOP concepts is essential for software development.
• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation details and showing only the necessary features.
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Q2. What is inheritance
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Inheritance is a concept in object-oriented programming where a class inherits attributes and methods from another class.
• Allows a class to inherit attributes and methods from another class

• Promotes code reusability and reduces redundancy

• Creates a parent-child relationship between classes

• Derived class can access all public and protected members of the base class

• Example: Class 'Car' can inherit from class 'Vehicle' to reu
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Q3. Abstraction use to be explained
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Abstraction is the concept of hiding complex details and showing only the essential features of an object.
• Abstraction allows us to focus on what an object does, rather than how it does it

• It helps in reducing complexity and improving efficiency

• Example: A car dashboard abstracts the internal workings of the car and provides only essential information to the driver
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It consists of general aptitude

3 questions were given to solve

Q1. It's was quite easy , they only asked about your resume
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Q2. Prepare well everything that you have mentioned in the resume
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Q1. It didn't get selected in this round
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First round was Aptitude test which contained questions from every major subject from CS/IT i.e., DBMS, OS, Computer Networks. It also had Maths aptitude and Verbal, and 2 coding questions.

Q1. Polymorphism and its types
Ans. 
Polymorphism is the ability of an object to take on many forms.
• Polymorphism allows objects of different classes to be treated as if they are of the same class.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Compile-time polymorphism is achieved through method overloading, where multiple methods have the same name but different parameters.

• Runtime polymorphism is ach...read more
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Q2. SQL Joins query
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Q1. I didn't get selected for this round but my friends told me that they just asked if you are comfortable with salary, bond and relocation. Also the lady HR asked them to define the room, tell her something ...read more
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Aptitude,Reasoning,Verbal,Coding

Q1. Reading,Speaking,Listening
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Q1. Technical (based on projects) and HR questions
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The coding test was conducted in hackerearth platform.The questions are 4 dsa with 3 easy and 1 hard.

Q1. Logical question - you have a 3 gallon container and a 5 gallon container, how do you measure a 4 gallon volume. basic oops questions like define polymorphism, difference between class and object. basic ds...read more
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Q2. Basic oops questions like define polymorphism, difference between class and object. basic dsa question on sorting.
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