There are 4 rounds One day Process

1. Aptitude and Technical Test
2. Technical Interview
3. Managerial Interview
4. HR Interview

General aptitude 25 questions are there no negative marking u have to score at least 50% questions are on work and time, problems on train, reasoning

Technical Test based on core java only basic questions are there like which interface is helpful to store data in key value pair, how to initialize array

if u scored more than 50% then next round

Technical Interview based on core java, Started with introduction and principles of oops overloading and overriding concept multi threading, String constant pool, palindrome string program, wait and notify method exception handling, design pattern

after clearing technical round next will be

Managerial Interview

About your current project, technology and why u want to switch check about data structure what is concurrency api in java concurrent hashmap how it works exception handling overriding role

4 HR Interview

they are only discuss about your salary nothing else

How does a hashmap work internally?