PaySquare Consultancy Java Developer Interview Questions and Answers

Oops concepts in Java

• Encapsulation - hiding implementation details

• Inheritance - reusing code and creating parent-child relationships

• Polymorphism - multiple forms of a method or object

• Abstraction - creating abstract classes and interfaces

• Example: Encapsulation - using private variables and public methods

• Example: Inheritance - creating a subclass that inherits from a superclass

• Example: Polymorphism - using method overloa...read more

Altering columns in databases involves modifying the structure of a table by adding, deleting or modifying columns.

• Use ALTER TABLE statement to modify columns

• Add new columns using ADD COLUMN

• Delete columns using DROP COLUMN

• Modify columns using MODIFY COLUMN

• Changing column data type may result in data loss

Reversing a number in Java

• Convert the number to a string

• Use StringBuilder to reverse the string

• Convert the reversed string back to a number

To extract words from a line in Java, split the line using whitespace as delimiter.

• Use the split() method of String class

• Pass the whitespace regex as argument to split() method

• Iterate over the resulting array to get individual words

Handled a difficult situation by calming down an angry customer

• Listened to the customer's complaint patiently

• Empathized with the customer and apologized for the inconvenience caused

• Offered a solution to the problem and explained the steps to be taken

• Followed up with the customer to ensure their satisfaction

PWC is a leading global professional services firm with a strong reputation for excellence and innovation.

• PWC has a diverse range of clients across various industries

• PWC offers a wide range of services including audit, tax, and consulting

• PWC has a strong focus on innovation and technology

• PWC provides excellent opportunities for career growth and development

• PWC has a strong commitment to corporate responsibility and sus

PWC is a multinational professional services network.

• Provides audit, tax, and consulting services to various industries

• Has a presence in over 157 countries

• Ranked as the world's second-largest professional services network

• Clients include major corporations, governments, and non-profit organizations

Earthquakes occur due to the movement of tectonic plates. Metamorphosis is the process of transformation in living organisms.

• Earthquakes occur when two tectonic plates move against each other, causing a release of energy in the form of seismic waves.

• Metamorphosis is a process of transformation in living organisms, where an organism undergoes a physical change in form and structure.

• Examples of metamorphosis include the ...read more