Bankai Infotech Software Developer Interview Questions and Answers

Q1. What is HashMap?
Ans. 
HashMap is a data structure that stores key-value pairs and provides constant time complexity for basic operations.
• HashMap allows quick access to values based on their keys

• Keys must be unique and values can be duplicated

• HashMap is not thread-safe and requires synchronization for concurrent access

• Java's HashMap implementation uses hashing to distribute keys across buckets
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Q2. It’s a collection framework.
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Arrays, basics. easy, some important topics in python and sql

Q1. SQL basics question learned in online or self
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Q2. Joins, groupby, clause, projection, having
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The aptitude test was comprising of questions related to qualitative and quantitative reasoning along with basic computer science questions and coding questions also.

Q1. Why are pointers not used in Java but in C and C++ ?
Ans. 
Java has automatic memory management, so pointers are not needed.
• Java has a garbage collector that automatically manages memory.

• Pointers can lead to memory leaks and security vulnerabilities.

• C and C++ are low-level languages that require manual memory management.
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Q2. Types of access modifiers.
Ans. 
Access modifiers control the visibility and accessibility of class members.
• Public: accessible from anywhere

• Private: accessible only within the class

• Protected: accessible within the class and its subclasses

• Default: accessible within the same package
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Q3. Explain polymorphism.
Ans. 
Polymorphism is the ability of an object to take on many forms.
• Polymorphism allows objects of different classes to be treated as if they are of the same class.

• It is achieved through method overriding and method overloading.

• Examples include function overloading, operator overloading, and inheritance.

• Polymorphism helps in achieving loose coupling and flexibility in code design.
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Q1. Tell me something about yourself.
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Q2. Are you wishing to relocate ?
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Q3. Do you know about the bond ?
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Q1. Oops concept and the basic programming language knowledge
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Q2. Database queries and the database types
Ans. 
Database queries are used to retrieve data from databases. There are different types of databases such as relational, NoSQL, and graph databases.
• Relational databases use SQL for querying data

• NoSQL databases use different query languages such as MongoDB's query language

• Graph databases use graph traversal languages such as Cypher

• Queries can be used to retrieve specific data or perform complex operations such as joins and
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Q1. Tell me about yourself
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Q2. Tell me about the project
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Q1. Salary discussion and dreams
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Online aptitude test in which verbal logic coding part include

Q1. Most on resume ,pattern.project
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Q1. Hr questions,yourself , strength , weakness ,etc
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Q1. AWS basic questions were asked
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Q2. MongoDB, MySQL basic questions were asked
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