PayPal Interview Questions, Process, and Tips

Question base on Tree data structures

Q1. Explain GC collector in Java
Ans. 
GC collector in Java is responsible for managing memory by reclaiming unused objects and freeing up memory space.
• GC stands for Garbage Collector

• Automatically manages memory by reclaiming unused objects

• Prevents memory leaks and optimizes memory usage

• Different types of GC algorithms like Serial, Parallel, CMS, G1

• Example: System.gc() can be used to suggest garbage collection
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Q2. Dynamic programming algorithm question
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Q1. Low level design for Car rental system
Ans. 
Design a car rental system at a low level
• Use object-oriented programming to model cars, customers, rentals, etc.

• Implement a database to store information about available cars, customer bookings, etc.

• Include features like booking, returning, and searching for cars

• Consider implementing a pricing system based on factors like car type, duration of rental, etc.
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Q1. Salary discussion
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Ask about how to implement DQ

Q1. Introduction about yourself
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Q2. Basic golang questions
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Coding questions on DSA

Q1. Basic Java related questions, OOPs concepts
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Q2. Write code for encryption of the code
Ans. 
Encryption of code involves converting plaintext into ciphertext to secure data.
• Choose a strong encryption algorithm like AES or RSA

• Generate a key for encryption

• Encrypt the plaintext using the key and algorithm

• Store or transmit the ciphertext securely
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Q1. Java Related questions, also some system design-related questions
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Q2. Show the abstraction and write code for function overriding
Ans. 
Abstraction is hiding the implementation details, function overriding is providing a new implementation for a method in a subclass.
• Abstraction involves hiding the complex implementation details and showing only the necessary features to the user.

• Function overriding occurs in inheritance when a subclass provides a specific implementation for a method that is already defined in its superclass.

• Example: Parent class 'Anima...read more
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Q1. Normal questions related to projects and work ethics
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Coding test was on HackerRank

Q1. Easy-Medium DSA Questions
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Q1. Asked from my resume
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Javascript questions on Hacker rank with pair programming

Q1. Adv javscript questions
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Q2. React code writing in hacker rank
Ans. 
The question involves writing React code in HackerRank.
• Understand the requirements of the task before starting to write the code.

• Use React components to create a user interface.

• Handle state management and user interactions using React hooks.

• Write clean and efficient code to solve the problem.

• Test the code thoroughly before submitting.
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Q1. Design Rate Limiter LLD
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Q2. What are SOLID Principles? Springboot questions
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