Denholm Yam steel Factory Planning Engineer Interview Questions and Answers

HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.

• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• HashMap uses the hashCode() method of ke...read more

JDK 8 features include lambda expressions, functional interfaces, streams, and default methods.

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

• Functional interfaces enable the use of lambda expressions.

• Streams provide a way to work with sequences of elements efficiently.

• Default methods allow interfaces to have concrete methods.

• Date and Time API improvements.

Deep copy creates a new object and recursively copies all nested objects, while shallow copy creates a new object and copies the references to nested objects.

• Deep copy duplicates all levels of the object hierarchy, ensuring that changes in the copied object do not affect the original object.

• Shallow copy only duplicates the top-level object, so changes in the copied object may affect the original object.

• Deep copy is mor...read more

Ways to set values in form groups

• Use setValue() method to set values in form groups

• Use patchValue() method to set values in form groups

• Use reset() method to set values in form groups

To add a dynamic component in a view, use a framework or library that supports dynamic rendering and component creation.

• Use a framework like React or Angular that allows for dynamic component creation

• Create a component factory or use a component resolver to dynamically create and render components

• Pass data or props to the dynamic component to customize its behavior

• Update the view or component tree to include the dynami

Concurrent Utility Classes provide support for concurrent programming in Java.

• ConcurrentHashMap: Thread-safe implementation of Map interface.

• CopyOnWriteArrayList: Thread-safe implementation of List interface.

• CountDownLatch: Synchronization aid that allows one or more threads to wait until a set of operations being performed in other threads completes.

• Semaphore: Controls the number of threads that can access a shared re...read more

Automate credits of regularly updated VM using scripts

• Create a script to automatically update the VM on a regular schedule

• Utilize tools like Ansible or Puppet for automation

• Set up a cron job to run the script at specified intervals

• Ensure proper testing and monitoring of the automation process

Create a docker file to make mongodb available for developers

• Use the official MongoDB Docker image as the base image

• Expose the default MongoDB port (27017)

• Set up any necessary environment variables or configurations

• Build the Docker image using the Dockerfile

• Run the Docker container with the MongoDB image