TCS Java Developer Interview Questions, Process, and Tips

Q1. What is different between hashmap and hashtable
Ans. 
HashMap is non-synchronized and allows null values, while Hashtable is synchronized and does not allow null keys or values.
• HashMap is non-synchronized, meaning it is not thread-safe, while Hashtable is synchronized and thread-safe.

• HashMap allows null values and one null key, while Hashtable does not allow null keys or values.

• HashMap is generally preferred for non-thread-safe applications, while Hashtable is used in thr
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Q2. Features of java 8
Ans. 
Java 8 introduced several new features including lambda expressions, functional interfaces, streams, and default methods in interfaces.
• Lambda expressions allow you to write code in a more concise and readable way.

• Functional interfaces are interfaces with a single abstract method, used for lambda expressions.

• Streams provide a way to work with sequences of elements in a functional style.

• Default methods in interfaces allo...read more
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Q3. Tell me spring boot Annotation?
Ans. 
Spring Boot annotations are used to simplify the development process by providing shortcuts for common tasks.
• Annotations like @SpringBootApplication, @RestController, @Autowired, @GetMapping, @PostMapping are commonly used in Spring Boot applications.

• These annotations help in configuring the application, defining REST endpoints, injecting dependencies, and mapping HTTP requests to controller methods.

• For example, @Sprin...read more
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Q4. What is the dependency injection
Ans. 
Dependency injection is a design pattern in which the dependencies of an object are provided externally rather than created within the object itself.
• Dependency injection helps in achieving loose coupling between classes.

• It allows for easier testing by providing mock dependencies.

• There are three types of dependency injection: constructor injection, setter injection, and interface injection.

• Example: Spring framework uses...read more
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Q5. What are the type of bean scope
Ans. 
Bean scope in Java includes singleton, prototype, request, session, and application scopes.
• Singleton scope: Default scope, only one instance per Spring container.

• Prototype scope: New instance created each time bean is requested.

• Request scope: Bean created for each HTTP request.

• Session scope: Bean created for each HTTP session.

• Application scope: Bean created once for entire web application.
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Q1. Java 8 features
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Q2. Spring boot annotations
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Q1. Questions were mainly on java on topics like String, Internal implementation of HashMap, OOPs, Thread, Java 8 features. Coding question - How to reverse a string without using built in methods.
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Q1. Why are you switching? Expected CTC? Available for relocation?
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Discussion about the java featurs

Q1. Tell me about yourself.
Ans. Hello sir. Thanks for giving me the opportunity to introduce myself.my name is nikkita rawlo. I am from ichhapuram . I am creative and hardworking person. I completed my ssc in my nagitive place with pass percentage 77. I completed my intermediat with percent of 70. I completed my graduation in Ambedkar university of my locality government degree Collage my percentage of 60. A i have capable skills in the java program...read more
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Q2. Why should we hire u?
Ans. I have a knowledge about the java cooding and pythone cooding .and other basic languages.i think i suitable for this job role.tahts why u should hire me for this job role.
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Q1. Tell me about yourself
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Q2. Tell me about your experience
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Q1. ConcurrentHashmap details
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Q2. Executor feamework
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Q3. String concept in detail
Ans. 
String is a sequence of characters used to represent text in programming languages.
• Strings are immutable in Java, meaning their values cannot be changed once they are created.

• Strings can be created using double quotes or by calling the String constructor.

• String concatenation can be done using the '+' operator.

• Common methods for manipulating strings include length(), charAt(), substring(), toUpperCase(), toLowerCase().
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Q4. How microservices communicate
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Microservices communicate through lightweight protocols like HTTP, messaging queues, and RPC.
• HTTP: RESTful APIs are commonly used for communication between microservices.

• Messaging queues: Services can communicate asynchronously through message brokers like RabbitMQ or Kafka.

• RPC (Remote Procedure Call): Services can directly call each other's functions over the network.
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Q5. How java api work
Ans. 
Java API works by providing a set of classes and interfaces that allow developers to interact with various functionalities and services.
• Java API provides a standardized way for developers to access and use pre-built classes and interfaces.

• Developers can use Java API to perform tasks such as file handling, networking, database access, and more.

• Java API documentation provides detailed information on how to use each class...read more
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