Kerakoll Interview Questions and Answers

Reverse the words in a string of a specific length.

• Split the input string into words

• Iterate through the words and reverse the ones with a length equal to the specified length

• Join the reversed words back into a single string

Write a Java program to print unique elements from two given arrays.

• Create a HashSet to store unique elements from both arrays.

• Iterate through each element in both arrays and add them to the HashSet.

• Convert the HashSet back to an array and print the unique elements.

Microservice architecture is a design approach where an application is composed of small, independent services that communicate over well-defined APIs.

• Microservices communicate with each other through APIs, typically using HTTP/REST or messaging protocols like RabbitMQ or Kafka.

• Service discovery mechanisms like Eureka or Consul can be used to locate and connect to other microservices.

• API gateways can be used to manage and secure communication between microservices.

• Microservic...read more

Java 8 introduced new features like lambda expressions and streams. HashMap in Java 8 has improvements like tree bins for better performance.

• Java 8 features include lambda expressions, streams, default methods in interfaces, etc.

• Internal working of HashMap involves using buckets and linked lists or trees for collision resolution.

• In Java 8, HashMap introduced tree bins to handle situations where a bucket has too many elements, improving performance.

• Enhancements in Java 8 HashM...read more

Count occurrence of each character in a given string.

• Create an array of size 256 to store count of each character (ASCII range)

• Iterate through the string and increment count for each character

• Print the count of each character at the end