Arcon TechSolutions Senior Software Developer Interview Questions and Answers

REST API is lightweight, flexible, and widely used, while SOAP API is more rigid and heavy.

• REST API uses standard HTTP methods like GET, POST, PUT, DELETE, while SOAP API uses XML for communication.

• REST API is stateless and can be cached, making it faster, while SOAP API is stateful and requires more bandwidth.

• REST API is easier to implement and understand, while SOAP API has more built-in security features.

• Examples: R

Dependency Injection is a design pattern where the dependencies of a class are provided from the outside rather than created within the class itself.

• Allows for easier testing by providing mock dependencies

• Promotes loose coupling between classes

• Improves code reusability and maintainability

• Commonly implemented using frameworks like Spring in Java

Maintaining security in applications involves implementing encryption, authentication, authorization, and regular security audits.

• Implement encryption to protect data in transit and at rest

• Use strong authentication mechanisms like multi-factor authentication

• Implement proper authorization controls to restrict access to sensitive data

• Regularly conduct security audits and penetration testing to identify vulnerabilities

CTE stands for Common Table Expressions, used to create temporary result sets within a SQL query.

• CTE is defined using the WITH keyword in SQL.

• It helps in simplifying complex queries by breaking them into smaller, more manageable parts.

• CTEs can reference themselves recursively, making them useful for hierarchical data.

• Example: WITH cte AS (SELECT * FROM table_name) SELECT * FROM cte;

Print even and odd numbers between 1 to 20.

• Iterate from 1 to 20 and check if the number is even or odd.

• Use a conditional statement to determine if the number is even or odd.

• Print the number along with its type (even or odd).

Map transforms each element of a collection, while flatMap transforms each element into a new collection and flattens the result.

• Map applies a function to each element of a collection and returns a new collection with the results

• FlatMap applies a function that returns a collection to each element of a collection, then flattens the result into a single collection

• Example: map([1, 2, 3], x => [x, x+1]) returns [[1, 2], [2...read more

Comparable is an interface used for comparing objects, while Comparator is a separate class used for custom sorting.

• Comparable is implemented by the class whose objects need to be compared, while Comparator is a separate class used for custom sorting.

• Comparable has a single method, compareTo(), which is used to compare objects, while Comparator has a method, compare(), for custom sorting logic.

• Comparable is used for na...read more

Sorts an array of strings in ascending order.

• Use a sorting algorithm like bubble sort, insertion sort, or quicksort.

• Compare adjacent elements and swap them if they are in the wrong order.

• Repeat the process until the array is sorted.