Axis Bank Java Developer Interview Questions and Answers

Java and sql questions

Q1. Basics of java ans core java
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Trapping rain water and median of two sorted array

Q1. Oops and dbms questions?
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Q2. Code question in Array and string?
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Q1. Tell me about yourself
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1)Buy and sell stock
2)2 sum
3) system design
4) Elastic search
5) deployment

Q1. Explain Encapsulation
Ans. 
Encapsulation is the concept of bundling data and methods that operate on the data into a single unit.
• Encapsulation helps in hiding the internal state of an object and only exposing necessary functionalities.

• It allows for better control over the data by preventing direct access from outside the class.

• Encapsulation also helps in achieving data abstraction and information hiding.

• Example: In a class representing a car, th...read more
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Q2. How to call rest API
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To call a REST API, you can use tools like Postman or code in languages like JavaScript or Python.
• Use tools like Postman to make HTTP requests to the API endpoints

• In programming languages like JavaScript, use libraries like Axios or Fetch to make API calls

• Include necessary headers, parameters, and authentication tokens in the request

• Handle the response data accordingly, whether it's JSON, XML, or other formats
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It was spring boot java based online round

Q1. Optional in java.
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Q2. Eager and lazy initialization in simgleton design pattern
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Eager initialization creates the instance of Singleton class at the time of class loading, while lazy initialization creates the instance only when it is required.
• Eager initialization can lead to resource wastage if the instance is never used.

• Lazy initialization is more efficient as it only creates the instance when needed.

• Eager initialization is thread-safe by default, while lazy initialization requires synchronizatio...read more
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Q1. Why string is immutable
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String is immutable in Java to ensure thread safety, security, and optimization.
• Immutable strings are thread-safe as they cannot be modified concurrently by multiple threads.

• String pooling is possible due to immutability, saving memory and improving performance.

• Security is enhanced as sensitive information stored in strings cannot be altered.

• Examples: String str = "Hello"; str.concat(" World"); // str remains "Hello"
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Q2. What is spring aop
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Spring AOP (Aspect-Oriented Programming) is a framework that provides cross-cutting concerns in a modular way.
• Spring AOP allows separating cross-cutting concerns from the main application logic.

• It enables developers to define aspects (cross-cutting concerns) separately and apply them to multiple classes.

• Examples of cross-cutting concerns include logging, security, and transaction management.
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2 questions ...........................................................................................

Q1. Dbms related and computer subjects
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Q2. Oops related and one coding
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Q1. This was hr and technical both
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