Shivit Technologies Java Developer Interview Questions and Answers

Q1. They asked some core Java Concepts,String,Java 8,SpringBoot Architecture,Stream API code
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Q1. Explain how hashmap internally works
Ans. 
HashMap internally uses an array of linked lists to store key-value pairs.
• HashMap uses hashing to determine the index of the key in the array.

• If multiple keys hash to the same index, a linked list is used to store them.

• When retrieving a value, the key is hashed to find the index and then the linked list is searched for the key.
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Q2. Difference between vector and Arraylist
Ans. 
Vector is synchronized and slower, ArrayList is unsynchronized and faster.
• Vector is synchronized, ArrayList is not.

• Vector is slower due to synchronization, ArrayList is faster.

• Vector is legacy class, ArrayList is part of Java Collections framework.

• Vector doubles its size when full, ArrayList increases by 50%.
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Very difficult aptitude questions

Resources coding round

Q1. Very difficult questions
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Q2. Coding program is very difficult
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Java progaming, coding

3 coding questions were given and to be solved only in java

Good Question on string mostly

Q1. Springboot java react js
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Q1. Oops, polymorphism
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Find the 2nd highest number

Few programs to write and execute

Q1. All about microservices and spring boot
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Q2. Hibernate related they asked many questions
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