TCS Java Spring Boot Developer Interview Questions and Answers

Q1. Method overriding Method overloading Exception Java 8 Find the 2nd non repeating character from a string Find the sum of square of even numbers
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Q2. About project
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Q1. About project many questions
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Q2. Palindrome code
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Q1. Auto configuration?
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Q2. Defrance between String and String Buffer?
Ans. 
String is immutable, String Buffer is mutable.
• String is immutable, meaning its value cannot be changed once it is created.

• String Buffer is mutable, meaning its value can be changed after it is created.

• String is faster and more memory efficient for simple string operations.

• String Buffer is slower but more efficient for operations that require frequent modifications.
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It was an aptitude test with 60 minutes time.

You have to solve 3 basic coding question

Q1. What is singleton class? Inheritance, Polymorphism, Annotations in spring boot.
Ans. 
A singleton class is a class that allows only one instance of itself to be created and provides a global point of access to that instance.
• Singleton classes are often used in Spring Boot for managing resources such as database connections or thread pools.

• In Spring Boot, singleton beans are created by default, meaning that only one instance of a bean is created and shared across the application.

• To create a singleton bean...read more
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Q1. In this round I have been asked for my current roles and responsibilities in current organization, Questions on Design pattern, CI/CD pipeline.
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Q1. Difference between http status 204 and 404
Ans. 
HTTP status 204 means no content, while 404 means not found.
• HTTP status 204 indicates a successful request, but with no content to return.

• HTTP status 404 indicates that the requested resource could not be found on the server.

• HTTP status 204 is often used for successful DELETE requests where no content needs to be returned.

• HTTP status 404 is commonly seen when a user tries to access a non-existent URL.
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Q1. What are java8 features? Why string is immutable? Difference between the checked exception and unchecked exception? Difference between throw and throws? Difference between inner class and anonymous cla...read more
Ans. 
Answers to common Java Spring Boot Developer interview questions.
• Java8 features include lambda expressions, functional interfaces, streams, and default methods.

• String is immutable in Java to ensure thread safety and prevent unintended modifications.

• Checked exceptions are checked at compile time, while unchecked exceptions are not. Example: IOException vs NullPointerException.

• throw is used to explicitly throw an excepti...read more
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Q1. Some behavioural questions and discussed about packages
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Q1. Difference between springboot and Spring
Ans. 
Spring is a framework for building Java applications, while Spring Boot is a tool for easily creating stand-alone, production-grade Spring-based applications.
• Spring is a framework that provides comprehensive infrastructure support for developing Java applications.

• Spring Boot is a tool that simplifies the process of creating and deploying Spring-based applications.

• Spring Boot includes embedded servers, which makes it ea...read more
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Q2. What is stateless and stateful API
Ans. 
Stateless API does not store client state on the server, while stateful API does.
• Stateless API: Each request from client to server must contain all necessary information for the server to fulfill the request. No client state is stored on the server. Example: RESTful APIs.

• Stateful API: The server stores client state, which can be accessed by subsequent requests. Example: HTTP sessions.
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