Wipro Java Developer Interview Questions and Answers

Q1. Pillars of OOPS.
Ans. 
Pillars of OOPS are Inheritance, Encapsulation, Abstraction, and Polymorphism.
• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Abstraction: Hiding the complex implementation details and showing only the necessary features.

• Polymorphism: Ability of a method to do different things based on the object it is...read more
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Q2. Exception Vs Error
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Exceptions are events that can be handled programmatically, while errors are typically unrecoverable issues.
• Exceptions are checked at compile time, while errors are unchecked.

• Exceptions are subclasses of Throwable, while errors are subclasses of Error.

• Examples of exceptions include NullPointerException, ArrayIndexOutOfBoundsException, while examples of errors include OutOfMemoryError, StackOverflowError.
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Q3. Custom exception
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Custom exceptions in Java allow developers to create specific error handling tailored to their application's needs.
• Define a custom exception by extending the Exception class: `public class MyCustomException extends Exception {}`

• Use constructors to pass error messages: `public MyCustomException(String message) { super(message); }`

• Throw the custom exception using the `throw` keyword: `throw new MyCustomException("Error o...read more
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Q4. Structure of JVM
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JVM is the virtual machine that runs Java bytecode, providing platform independence.
• JVM stands for Java Virtual Machine

• It is responsible for interpreting Java bytecode and executing it on the underlying hardware

• JVM has components like Class Loader, Bytecode Verifier, Interpreter, Just-In-Time Compiler, and Garbage Collector
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Q5. Annoatation of Spring REST
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Spring REST annotations are used to simplify the development of RESTful web services in Spring framework.
• Annotations like @RestController, @RequestMapping, @GetMapping, @PostMapping, @PutMapping, @DeleteMapping are commonly used in Spring REST.

• These annotations help in mapping HTTP requests to specific handler methods, defining request mappings, and handling request parameters.

• For example, @GetMapping("/users") will ma...read more
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Q6. Complete Spring MVC Flow .
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It was Quite good and simple

Q1. Difference between primary and unique key
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Q2. What are Threads?
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Q1. Explain your project, explain microservice you have been used in service
Ans. 
In my project, I developed a microservice architecture for an e-commerce platform, enhancing scalability and maintainability.
• Service Decomposition: The application was divided into multiple microservices, such as User Service, Product Service, and Order Service, each handling specific functionalities.

• API Gateway: An API Gateway was implemented to manage requests and route them to the appropriate microservices, simplify...read more
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Q2. What is kafka.
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Q1. Oops concept and collections
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Q2. MySql and springBoot
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Q1. Core Java Concepts
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Q2. Spring Concepts
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Q1. Oops concepts and Multi threading
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Q1. Notice period and basic HR questions
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