Appiness Interactive Reactjs Developer Interview Questions and Answers

A marker interface is an interface with no methods used to mark a class as having a particular property or behavior.

• Marker interfaces are used to provide metadata about a class.

• They are often used in frameworks and libraries to indicate that a class should be treated in a special way.

• Examples include Serializable, Cloneable, and Remote interfaces in Java.

• Marker interfaces can also be used to enforce design patterns, su

Thread concurrency refers to multiple threads executing simultaneously in a program.

• Concurrency allows for efficient use of resources and can improve performance.

• However, it can also lead to race conditions and other synchronization issues.

• Synchronization mechanisms like locks and semaphores can be used to manage concurrency.

• Examples of concurrent programming languages include Java and Python's threading module.

List is mutable, tuple is immutable in Python.

• Lists are mutable, meaning their elements can be changed after creation.

• Tuples are immutable, meaning their elements cannot be changed after creation.

• Lists are defined using square brackets [], tuples using parentheses ().

• Lists are typically used for collections of similar items, tuples for fixed collections of dissimilar items.

Generators in Python are functions that allow you to iterate over a sequence of items without storing them all in memory at once.

• Generators are created using a function with 'yield' instead of 'return'.

• They are used to generate a sequence of values lazily, one at a time.

• Generators are memory efficient as they do not store all values in memory at once.

• Example: def my_generator(): for i in range(5): yield i

• Example: ...read more

ASP.NET is a web development framework while ADO.NET is a data access technology for connecting to databases.

• ASP.NET is used for building web applications, while ADO.NET is used for accessing and manipulating data from databases.

• ASP.NET provides a framework for creating dynamic web pages, handling user input, and managing state, while ADO.NET provides a set of classes for interacting with databases.

• ASP.NET includes fea...read more

Functions return a value while stored procedures do not.

• Functions are used to perform a specific task and return a value to the caller.

• Stored procedures are used to execute a set of SQL statements and do not return a value.

• Functions can be used in SQL statements while stored procedures cannot.

• Functions can be called from within stored procedures.

• Functions are deterministic while stored procedures may not be.

• Functions c...read more

Interface is a contract that defines the methods a class must implement. Inheritance is the ability of a class to inherit properties and methods from another class.

• Interface is used to achieve abstraction and multiple inheritance in Java.

• Inheritance allows code reuse and promotes code organization.

• Overloading is having multiple methods with the same name but different parameters.

• Overriding is providing a different impl...read more