Webbaysys Technologies Interview Questions and Answers

The basic pillars of OOP are encapsulation, inheritance, and polymorphism.

• Encapsulation: bundling of data and methods that operate on that data within a single unit

• Inheritance: ability of a class to inherit properties and methods from a parent class

• Polymorphism: ability of objects to take on multiple forms or behaviors depending on the context

NoSQL databases are used for scalability, flexibility, and handling unstructured data.

• Scalability: NoSQL databases can easily scale horizontally to handle large amounts of data and high traffic.

• Flexibility: NoSQL databases do not require a predefined schema, allowing for easy modifications and additions to data.

• Handling unstructured data: NoSQL databases are well-suited for storing and querying unstructured data like documents, graphs, and key-value pairs.

• Examples: MongoDB, C...read more

Private members are accessible only within the same class, while protected members are accessible within the same class and its subclasses.

• Private members can only be accessed within the same class

• Protected members can be accessed within the same class and its subclasses

• Private members are not inherited by subclasses

• Protected members are inherited by subclasses

JRE is a runtime environment, JDK is a development kit, and JVM is a virtual machine.

• JRE stands for Java Runtime Environment and is used to run Java applications.

• JDK stands for Java Development Kit and is used to develop Java applications.

• JVM stands for Java Virtual Machine and is responsible for executing Java bytecode.

• JDK includes JRE and additional development tools such as compilers and debuggers.

• JVM is platform-dependent and provides a layer of abstraction between Java c...read more

Remove duplicate strings in an array

• Use a Set data structure to store unique strings

• Iterate through the array and add each string to the Set

• Convert the Set back to an array to get the final result