10+ Linfox Logistics Interview Questions and Answers

Spring Boot uses autoconfiguration to automatically configure the Spring application based on dependencies and properties.

• Spring Boot autoconfiguration is achieved through @EnableAutoConfiguration annotation

• Autoconfiguration classes are located in the org.springframework.boot.autoconfigure package

• Autoconfiguration classes are conditionally applied based on the presence of specific classes or properties

To accumulate heap to the JVM, specify the initial and maximum heap size using -Xms and -Xmx flags respectively.

• Use -Xms flag to specify the initial heap size, e.g. -Xms512m for 512 MB.

• Use -Xmx flag to specify the maximum heap size, e.g. -Xmx1024m for 1 GB.

• Example: java -Xms512m -Xmx1024m YourClassName

Application server manages business logic while web server handles HTTP requests.

• Application server provides services like security, transaction management, messaging, etc.

• Web server handles HTTP requests and serves static content like HTML, CSS, JS, etc.

• OOPS is a programming paradigm that focuses on objects and their interactions.

• Collection is a framework that provides interfaces and classes to store and manipulate groups of objects.

• Thread is a lightweight process that enabl...read more

My area of interest for new techniques includes cloud computing, machine learning, and microservices architecture.

• Cloud computing: Interested in exploring AWS, Azure, and Google Cloud Platform for scalable and cost-effective solutions.

• Machine learning: Excited about implementing algorithms for data analysis and predictive modeling.

• Microservices architecture: Looking into breaking down monolithic applications into smaller, independent services for better scalability and flexib...read more

JVM works with Hashmap by using hash codes to store and retrieve key-value pairs efficiently.

• JVM uses hash codes to determine the bucket location for each key-value pair in the Hashmap.

• Hashmap uses a hashing function to convert keys into hash codes, which are then used to find the corresponding bucket in the underlying array.

• In case of hash collisions, where multiple keys map to the same bucket, Hashmap uses linked lists or balanced trees to store multiple entries in the same...read more

The == operator compares memory addresses, while the equals method compares the actual content of objects.

• The == operator checks if two object references point to the same memory location.

• The equals method checks if two objects have the same content.

• Example: String str1 = new String("hello"); String str2 = new String("hello"); str1 == str2 will return false, but str1.equals(str2) will return true.

Use Java 8 streams to find duplicate characters in a string.

• Convert the string to a character array

• Use streams to group by characters and count occurrences

• Filter out characters with count greater than 1

• Collect the duplicate characters into an array

HashMap is not thread-safe while ConcurrentHashMap is thread-safe.

• HashMap is not thread-safe and can lead to ConcurrentModificationException if modified during iteration.

• ConcurrentHashMap allows concurrent modifications without the need for external synchronization.

• ConcurrentHashMap achieves thread-safety by dividing the map into segments, allowing multiple threads to operate on different segments concurrently.

• ConcurrentHashMap is suitable for high-concurrency scenarios where...read more

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

• Lambda expressions allow you to write code in a more concise and readable way.

• Streams provide a way to work with collections of objects in a functional style.

• Functional interfaces are interfaces with a single abstract method, which can be implemented using lambda expressions.

• Default methods allow interfaces to have method implementations.

• Other features incl...read more