Persistent Systems Interview Questions, Process, and Tips

Q1. HOW JVM works ?
Ans. 
JVM is a virtual machine that executes Java bytecode. It manages memory, provides security, and facilitates garbage collection.
• JVM loads the bytecode generated by the Java compiler and interprets it.

• It uses Just-In-Time (JIT) compilation to improve performance by compiling frequently used code into native machine code.

• JVM manages memory through garbage collection, freeing up memory occupied by objects that are no longe...read more
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Q2. Hash Map internal working?
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Hash Map is a data structure that stores key-value pairs and uses a hash function to map keys to their corresponding values.
• Hash Map uses a hash function to determine the index of the key-value pair in the underlying array.

• Collisions can occur when multiple keys hash to the same index, which can be resolved using techniques like chaining or open addressing.

• Hash Map provides constant time complexity O(1) for insertion,
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Q1. What is stereo annotation ?
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Stereo annotation is the process of labeling or tagging images or videos with depth information to create a 3D effect.
• Stereo annotation involves identifying corresponding points in a pair of images or frames to determine depth perception.

• It is commonly used in computer vision tasks such as object detection, tracking, and scene understanding.

• Examples of stereo annotation include creating depth maps for autonomous drivin
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Q2. Muti threading.
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Verbal, qunt, english etc..

Basic coding questions

Q1. What is abstract class Difference between final,finally finalize Different types of polymorphism
Ans. 
Abstract class is a class that cannot be instantiated and may contain abstract methods.
• Abstract class cannot be instantiated directly.

• It may contain abstract methods that must be implemented by the subclass.

• Example: abstract class Shape { abstract void draw(); }
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Q1. I was asked to solve a puzzle and solve a coding question. I solved both but don't know why I was not selected.
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Q2. 1 puzzle 1 coding question related to pattern
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Goods questions were asked on problem solving.

Q1. Goroutines, Channels,
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Q2. Heap data structures
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Q1. Write class to accept details of student
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Class to accept details of student
• Create a class named Student with attributes like name, age, grade, etc.

• Include a method to input details of the student.

• Use constructor to initialize the attributes with input values.
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Q2. What's is **kwargs in python
Ans. 
kwargs in Python is a special syntax that allows you to pass a variable number of keyword arguments to a function.
• kwargs stands for keyword arguments.

• It is used in Python functions to accept a variable number of keyword arguments.

• kwargs is represented by a double asterisk (**).

• Example: def my_func(**kwargs):
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Q3. What are magical methods
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Magical methods are special methods in Python that begin and end with double underscores, used for operator overloading and other special behaviors.
• Magical methods are also known as dunder methods, short for 'double underscore'.

• They are used to define how objects of a class behave when certain operations are performed on them, such as addition, subtraction, comparison, etc.

• Examples of magical methods include __init__ f...read more
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Aptitude test normal questions

Q1. Basic Question on Arrays
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Q2. Basic questions on string manipulation
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