Iris Medical Solutions Java Developer Interview Questions and Answers

Q1. Circuit breaker pattern
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Q2. Aws S3 access via ECS
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Q1. Time Complexity
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Q2. Coding question and SQL queries
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Easy question

Q1. What is aray in Java
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An array in Java is a collection of similar type of elements stored in contiguous memory locations.
• Arrays can be of primitive data types like int, float, etc. or reference types like String, Object, etc.

• Arrays have a fixed size and can be accessed using an index starting from 0.

• Arrays can be initialized during declaration or later using the new keyword.

• Example: String[] names = {"John", "Mary", "Bob"};

• Example: int[] nu...read more
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Q2. Byte code flot and double
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Q1. What is java and why its imp
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Java is a high-level programming language known for its portability, security, and versatility.
• Java is platform-independent, meaning it can run on any device with a Java Virtual Machine (JVM).

• It is object-oriented, allowing for modular and reusable code.

• Java is widely used in web development, mobile applications, enterprise software, and more.

• Its strong security features make it a popular choice for building secure app...read more
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Q2. What is javascript and c++ and why its imp
Ans. 
JavaScript and C++ are programming languages used for web development and system programming respectively.
• JavaScript is a scripting language used for front-end web development.

• C++ is a high-level programming language used for system programming and software development.

• JavaScript is essential for creating interactive web pages and dynamic content.

• C++ is important for developing high-performance applications and operati
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Q3. What is platform independence language
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Platform independence language refers to a programming language that can run on any platform without needing to be recompiled.
• Java is a platform independence language because it uses the Java Virtual Machine (JVM) to run on any platform.

• Platform independence allows Java programs to be written once and run anywhere, saving time and effort for developers.

• Other examples of platform independence languages include Python an
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Q1. Pillars of OOPS.
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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
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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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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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Spring MVC Flow involves DispatcherServlet, HandlerMapping, Controller, Model, ViewResolver, and View.
• Client sends a request to DispatcherServlet.

• DispatcherServlet consults HandlerMapping to determine the appropriate Controller.

• Controller processes the request, interacts with Model, and returns a logical view name.

• DispatcherServlet consults ViewResolver to map the logical view name to an actual View.

• View renders the re
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It was Quite good and simple

Q1. Difference between primary and unique key
Ans. 
Primary key uniquely identifies each record in a table, while unique key ensures that all values in a column are different.
• Primary key does not allow NULL values, while unique key allows one NULL value.

• A table can have only one primary key, but multiple unique keys.

• Primary key is automatically indexed, while unique key is not.

• Example: Primary key for a table of students could be student_id, while unique key could be em
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Q2. What are Threads?
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Threads are lightweight processes within a program that can run concurrently, allowing for multitasking and improved performance.
• Threads allow multiple tasks to be executed simultaneously within a single program

• Threads share the same memory space, allowing for efficient communication and data sharing

• Examples include a web server handling multiple client requests concurrently, or a video game running animations and user
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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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