eClinicalWorks Developer Interview Questions and Answers

Program for hashcode and equal implementation

• Override hashCode() method to generate unique hashcode for each object

• Override equals() method to compare two objects based on their attributes

• Ensure that if two objects are equal, their hashcodes should also be equal

• Use Objects.hash() method to generate hashcode for multiple attributes

• Example: public int hashCode() { return Objects.hash(attribute1, attribute2); }

• Example: pu...read more

HashMap is a data structure that stores key-value pairs and provides constant time complexity for basic operations.

• Hashmap uses hashing to store and retrieve values based on keys.

• It uses an array of buckets to store key-value pairs.

• The hash function maps the key to an index in the array.

• If multiple keys map to the same index, a linked list is used to store them.

• Basic operations like put, get, and remove have constant t...read more

Synchronized ensures only one thread can access a resource at a time, while concurrent allows multiple threads to access it simultaneously.

• Synchronized is used for thread safety and mutual exclusion.

• Concurrent is used for improving performance and scalability.

• Synchronized can cause performance issues due to locking.

• Concurrent can cause race conditions and requires careful synchronization.

• Examples of synchronized: synch...read more