10+ Software Java Engineer Interview Questions and Answers

Memory leakage can be managed by identifying and fixing the root cause of the issue.

• Use a profiler tool to identify the source of the memory leak

• Analyze the code to find out if there are any objects that are not being used and can be removed

• Ensure that all objects are properly disposed of after use

• Use weak references instead of strong references where possible

• Avoid creating unnecessary objects

• Regularly monitor memory usage and perform garbage collection as needed

Sort employees by cities using Stream API

• Create a list of employees with their respective cities

• Use Stream API to sort the list by cities

• Print the sorted list of employees

No, lambda expressions can only be used with functional interfaces.

• Lambda expressions are used to implement functional interfaces.

• Functional interfaces have only one abstract method.

• Lambda expressions provide a concise way to implement the abstract method of a functional interface.

• If a lambda expression is used without a functional interface, it will result in a compilation error.

My technology stack includes Java, Spring Boot, Hibernate, MySQL, and Angular.

• Java for backend development

• Spring Boot for creating RESTful APIs

• Hibernate for ORM

• MySQL for database management

• Angular for frontend development

• Experience with AWS and Docker

To change embedded server in Spring Boot, modify the pom.xml file and application.properties file.

• Update the pom.xml file with the desired server dependency

• Update the application.properties file with the server port and context path

• Restart the application to apply the changes

Implement programs to check array equality, find duplicates, and perform binary search algorithm in Java.

• To check if two arrays are equal, compare each element in both arrays.

• To find duplicates in an array, use a HashSet to store unique elements and identify duplicates.

• For binary search algorithm implementation, ensure the array is sorted and recursively divide the array to find the target element.

Imperative programming focuses on how to perform tasks, while declarative programming focuses on what the desired outcome is.

• Imperative programming involves explicitly specifying the steps to achieve a result, while declarative programming involves defining the desired result without specifying the steps.

• In imperative programming, the programmer has to manage the state of the program, while in declarative programming, the state is managed by the system.

• Examples of imperative ...read more

Steps to create a Spring Boot application

• Create a new Spring Boot project using Spring Initializr

• Add necessary dependencies in pom.xml or build.gradle file

• Create a main class with @SpringBootApplication annotation

• Create necessary packages and classes for controllers, services, and repositories

• Configure application properties in application.properties or application.yml file

• Run the application using IDE or command line

Spring Boot is a framework that simplifies the development of Java applications.

• Provides a pre-configured environment for building production-grade applications

• Uses embedded servers like Tomcat, Jetty, etc.

• Supports auto-configuration, which eliminates the need for manual configuration

• Offers a wide range of plugins and extensions for easy integration with other frameworks and tools

Microservices offer advantages such as scalability, flexibility, and easier maintenance.

• Scalability: Microservices can be scaled independently, allowing for better resource utilization and cost savings.

• Flexibility: Microservices can be developed and deployed independently, allowing for faster time-to-market and easier updates.

• Easier maintenance: Microservices are smaller and more focused, making it easier to identify and fix issues.

• Examples: Netflix, Amazon, and Uber all use ...read more

Hashing algorithm is a method used to convert data into a fixed-size string of bytes.

• Hashing algorithms are used to map data of arbitrary size to fixed-size values.

• They are commonly used in data structures like hash tables for fast data retrieval.

• Examples of hashing algorithms include MD5, SHA-1, and SHA-256.