Rakuten Interview Questions, Process, and Tips

Create Hashmap, Tell about hashet and some basic questions

Q1. Just asked about your experience,
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Q2. Did you read rakuten book
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Round duration - 60 minutes
Round difficulty - Easy

Technical Interview round with questions on DSA.

Q1. 
Merge Two Sorted Arrays Problem Statement
Given two sorted integer arrays ARR1 and ARR2 of size M and N, respectively, merge them into ARR1 as one sorted array. Assume that ARR1 has a size of M + N to hol...read more
Ans. 
Merge two sorted arrays into one sorted array in place.
• Iterate from the end of both arrays and compare elements to merge in place

• Use two pointers to keep track of the current position in each array

• Handle cases where one array is fully merged before the other
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Q2. 
Reverse a Stack Using Recursion
You are given a stack of integers. Your task is to reverse the stack using recursion without using any extra space other than the internal stack space used due to recursion...read more
Ans. 
Reverse a stack using recursion without using any extra space other than the internal stack space.
• Use recursion to pop all elements from the original stack and store them in function call stack

• Once the stack is empty, push the elements back in reverse order using recursion

• Make use of auxiliary functions to handle the recursion process
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Round duration - 60 minutes
Round difficulty - Easy

Technical Interview round with question on OOPS.

Q1. What is the JVM?
Ans. 
JVM stands for Java Virtual Machine, which is a virtual machine that enables a computer to run Java programs.
• JVM is an abstract computing machine that enables a computer to run Java programs.

• It provides a runtime environment in which Java bytecode can be executed.

• JVM is platform-independent, meaning Java code can run on any device that has a JVM installed.

• It manages memory, provides security, and facilitates garbage co...read more
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Q2. How are objects created and managed in JVM memory?
Ans. 
Objects in JVM memory are created on the heap and managed by the garbage collector.
• Objects are created on the heap memory in JVM.

• Memory for objects is allocated using the 'new' keyword.

• Objects are managed by the garbage collector to reclaim unused memory.

• Garbage collector uses different algorithms like Mark-Sweep, G1, etc.

• Example: 'String str = new String("Hello World");'
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Q3. What is polymorphism in Java?
Ans. 
Polymorphism in Java allows objects of different classes to be treated as objects of a common superclass.
• Polymorphism is achieved through method overriding and method overloading.

• Method overriding allows a subclass to provide a specific implementation of a method that is already provided by its superclass.

• Method overloading allows multiple methods with the same name but different parameters in the same class.

• Polymorphi...read more
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Q4. Can you explain method overriding in Java?
Ans. 
Method overriding in Java allows a subclass to provide a specific implementation of a method that is already provided by its superclass.
• In method overriding, a subclass provides a specific implementation of a method that is already provided by its superclass.

• The method in the subclass must have the same name, return type, and parameters as the method in the superclass.

• Method overriding is used to achieve runtime polymo...read more
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Normal Aptitude test quant

Java and DSA. DSA contains of 2 medium level question

Q1. Concept of Java , DSA and primary focus on personal project
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Q1. Will you need a sponsorship in the future
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Q2. What is your main language for program
Ans. 
My main language for programming is Java.
• I have been using Java for over 5 years.

• I am proficient in object-oriented programming with Java.

• I have experience in developing web applications using Java frameworks like Spring and Hibernate.
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One stack and queue related question, create queue using stack data structure and vise-versa?
Multi-threading question related with use cases?

Q1. Java OOPs question was asked, what is singleton and it's business use cases , Multi-threading questions
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Q1. This was managerial round, System Design question were asked
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