Associate Consultant Developer Interview Questions and Answers

Constructors are special methods used to initialize objects in a class.

• Constructors have the same name as the class and do not have a return type.

• They are called automatically when an object is created.

• Constructors can be parameterized to accept values for initializing object properties.

• Default constructors are provided by the compiler if no constructor is defined.

• Example: public class Person { public Person(String name) { this.name = name; } }

Java 8 introduced several new features including lambda expressions, functional interfaces, and streams.

• Lambda expressions allow for functional programming and concise code

• Functional interfaces are interfaces with a single abstract method, used for lambda expressions

• Streams allow for efficient processing of collections and parallel processing

• Method references simplify lambda expressions by referring to existing methods

• Optional class helps to avoid null pointer exceptions

• Defau...read more

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

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

• Each bucket contains a linked list of entries with the same hash code

• When a key-value pair is added, its hash code is used to determine the bucket and the entry is added to the linked list

• When a value is retrieved, the key's hash code is used to find the bucket and then the linked list is searched for the entry with the m...read more

HTTP methods are actions that can be performed on a web server to retrieve, update, or delete resources.

• GET - retrieve a resource

• POST - create a new resource

• PUT - update an existing resource

• DELETE - delete a resource

• HEAD - retrieve metadata about a resource

• OPTIONS - retrieve information about the communication options available for a resource

• PATCH - update a resource partially