Hansen Technologies Interview Questions, Process, and Tips

To prevent application downtime, implement redundancy, monitoring, automation, and disaster recovery plans.

• Implement redundancy by using load balancers, multiple servers, and failover systems.

• Set up monitoring tools to detect issues proactively and alert the team.

• Automate processes like deployments, scaling, and backups to reduce human errors.

• Create disaster recovery plans with backups, replication, and failover strate...read more

Iterate through a map and write code to perform operations on each key-value pair.

• Use a for loop to iterate through the map

• Access the key and value of each pair using the iterator

• Perform desired operations on the key-value pairs

Grep command is used to search for specific patterns in text files.

• Use 'grep' followed by the pattern you want to search for and the file name

• Use '-i' flag for case-insensitive search

• Use '-r' flag for recursive search in directories

• Use '-v' flag to invert the match and show lines that do not match the pattern

Collection hierarchy in Java refers to the relationship between different types of collections such as List, Set, and Map.

• Java collections framework includes interfaces like Collection, List, Set, and Map.

• List is an ordered collection that allows duplicate elements, Set is an unordered collection that does not allow duplicates, and Map is a key-value pair collection.

• Examples: ArrayList and LinkedList are classes that i...read more

Default method is a method in an interface with a default implementation.

• Introduced in Java 8 to allow adding new methods to interfaces without breaking existing implementations

• Default methods can be overridden in implementing classes

• Used to provide a default implementation for methods in interfaces

Hash table is a data structure that stores key-value pairs and uses a hash function to map keys to their corresponding values.

• Hash table consists of an array of buckets, each containing a linked list of key-value pairs.

• When inserting a key-value pair, the hash function is used to determine the index of the bucket where the pair should be stored.

• During retrieval, the hash function is used again to find the correct bucke...read more