Whishworks It Consulting Senior Software Engineer Interview Questions, Process, and Tips

Inheritance is a mechanism in object-oriented programming where a new class is created by inheriting properties of an existing class.

• Inheritance allows code reusability and promotes modular programming.

• The existing class is called the parent or base class, and the new class is called the child or derived class.

• The child class inherits all the properties and methods of the parent class and can also add new properties an...read more

Polymorphism is the ability of an object to take on many forms.

• Polymorphism allows objects of different classes to be treated as if they are of the same class.

• It helps in achieving loose coupling and flexibility in code.

• Examples include method overloading and overriding, and interfaces in Java.

• Polymorphism can also be achieved through inheritance and abstract classes.

Restful webservices are a way of building web services that use HTTP methods to access resources.

• REST stands for Representational State Transfer

• Uses HTTP methods like GET, POST, PUT, DELETE

• Resources are identified by URIs

• Responses are in JSON or XML format

• Stateless communication between client and server

• Example: Twitter API

Collections framework is a set of classes and interfaces that provide a way to store and manipulate groups of objects in Java.

• It provides interfaces like List, Set, Queue, etc. for storing collections of objects.

• It also provides classes like HashMap, TreeMap, etc. for storing key-value pairs.

• It simplifies the task of storing and manipulating data in Java programs.

• It is a part of the Java Collections API.

• Example: List&l...read more

Exception Handling is a mechanism to handle runtime errors and prevent program crashes.

• It is used to catch and handle errors that occur during program execution.

• There are two types of exceptions: checked and unchecked.

• Checked exceptions are checked at compile-time and must be handled or declared.

• Unchecked exceptions are not checked at compile-time and do not need to be handled or declared.

• Examples of exceptions include...read more