Persistent Systems Programmer Interview Questions and Answers

This program identifies and duplicates strings in an array, returning only the duplicates.

• Use a hash map to track occurrences of each string.

• Iterate through the array and populate the hash map.

• Filter the hash map to find strings with a count greater than one.

• Example: For input ['apple', 'banana', 'apple'], output should be ['apple'].

A constructor is a special type of method that is automatically called when an object is created in a class.

• Constructors have the same name as the class they belong to.

• They are used to initialize the object's state.

• Constructors can have parameters to customize the initialization process.

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

OOPS concepts refer to Object-Oriented Programming concepts which include classes, objects, inheritance, polymorphism, and encapsulation.

• Classes: Blueprint for creating objects with attributes and methods.

• Objects: Instances of classes that contain data and behavior.

• Inheritance: Ability to create new classes based on existing classes.

• Polymorphism: Ability to use a single interface for different data types.

• Encapsulation:...read more

Azure cloud services are a collection of integrated cloud services that developers and IT professionals use to build, deploy, and manage applications through Microsoft's global network of datacenters.

• Azure Virtual Machines

• Azure App Services

• Azure SQL Database

• Azure Blob Storage

• Azure Functions