Smifs Interview Questions and Answers

Java 8 introduced several new features including lambda expressions, functional interfaces, and streams.

• Lambda expressions allow for more concise and functional programming style.

• Functional interfaces enable the use of lambda expressions.

• Streams provide a powerful way to process collections of data in a functional manner.

• Default methods in interfaces allow for adding new methods to existing interfaces without breaking compatibility.

• Optional class helps to handle null values m...read more

Handle out-of-memory exception by analyzing heap dump and optimizing code.

• Analyze heap dump to identify memory leaks

• Optimize code to reduce memory usage

• Increase heap size if necessary

• Use memory profiling tools like JProfiler or VisualVM

• Avoid creating unnecessary objects

• Use caching to reduce object creation

• Implement garbage collection strategies

Shallow and deep comparison in Strings with code example

• Shallow comparison checks if two String variables refer to the same object in memory

• Deep comparison checks if two String variables have the same sequence of characters

• Shallow comparison can be done using the '==' operator

• Deep comparison can be done using the 'equals()' method

• Example: String str1 = 'hello'; String str2 = 'hello'; str1 == str2; //shallow comparison returns true

• Example: String str1 = 'hello'; String str2 = ...read more

A Spring Boot application follows a predefined flow of execution.

• Application starts with main() method

• Spring Application Context is initialized

• Beans are created and dependencies are injected

• Application starts serving requests

• Requests are handled by Controllers and Services

• Responses are returned to the client

Object-oriented programming concepts that help in organizing and designing code for reusability and maintainability.

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

• Inheritance: Allowing a class to inherit properties and behavior from another class.

• Polymorphism: Ability of objects to take on multiple forms or types.

• Abstraction: Hiding the implementation details and showing only the necessary features of an object.

Lambda expressions are anonymous functions that allow you to pass behavior as an argument to a method.

• Lambda expressions are used to provide a concise way to represent behavior as data.

• They are commonly used in functional programming and can be used to implement functional interfaces.

• Lambda expressions can be used to iterate through collections using the forEach method.

The Java memory model defines how threads interact through memory when accessing shared data.

• Defines the rules for reading and writing to shared variables in a multithreaded environment

• Ensures visibility of changes made by one thread to other threads

• Specifies the order in which operations are executed and how they are synchronized