CDK Global Interview Questions and Answers

SOLID principles are five design principles aimed at making software designs more understandable, flexible, and maintainable.

• S - Single Responsibility Principle: A class should have one reason to change. Example: A class handling user data should not also handle logging.

• O - Open/Closed Principle: Software entities should be open for extension but closed for modification. Example: Use interfaces to add new features...read more

This code reverses the order of words in a given string while maintaining the original word order.

• Split the string into words using space as a delimiter. Example: 'Hello World' -> ['Hello', 'World']

• Reverse the array of words. Example: ['Hello', 'World'] -> ['World', 'Hello']

• Join the reversed array back into a string with spaces. Example: ['World', 'Hello'] -> 'World Hello'

• Consider edge cases like multiple...read more

List is an ordered collection of items, while Dictionary is a collection of key-value pairs.

• List maintains the order of elements, while Dictionary does not guarantee any specific order.

• In List, elements are accessed by their index, while in Dictionary, elements are accessed by their keys.

• Example: List - [1, 2, 3], Dictionary - {'a': 1, 'b': 2, 'c': 3}

Unit test cases are written to test individual units or components of a software application.

• Identify the unit to be tested

• Write test cases to cover different scenarios such as positive, negative, and edge cases

• Use testing frameworks like JUnit or NUnit to write and execute the test cases

• Ensure the test cases are independent, isolated, and repeatable

• Include assertions to verify the expected behavior of the unit

ALB is application layer load balancer, NLB is network layer load balancer in AWS.

• ALB operates at Layer 7 and supports HTTP, HTTPS, and WebSocket protocols.

• NLB operates at Layer 4 and supports TCP, UDP, and TLS protocols.

• ALB can route traffic based on content of the request, NLB routes based on IP address and port.

• ALB is ideal for web applications, NLB is ideal for applications that require high performance and lo...read more

Thread concepts involve concurrent execution of multiple parts of a program.

• Threads allow for parallelism and can improve performance.

• Threads can communicate with each other through shared memory or message passing.

• Thread synchronization is important to prevent race conditions and deadlocks.

• Examples of thread concepts include multithreading, thread pools, and futures.

• Thread safety is important to ensure correct be...read more