Polycab Wires Interview Questions and Answers

Reverse items in array with highest values, skipping the lowest

• Sort the array in descending order

• Skip the lowest value(s)

• Reverse the remaining items

Java interface defines a contract for classes to implement, while abstract class provides common functionality for subclasses.

• Interface can only have abstract methods, while abstract class can have both abstract and non-abstract methods.

• A class can implement multiple interfaces but can only extend one abstract class.

• Interfaces are used to achieve multiple inheritance in Java, while abstract classes are used to provide a common base for subclasses.

• Interfaces are implicitly abs...read more

Implement a function to reverse a string in Go lang

• Create a function that takes a string as input

• Convert the string into a slice of bytes for easier manipulation

• Use a loop to iterate through the slice and reverse the order of characters

• Convert the reversed slice back into a string and return it

To test a faulty ATM, simulate various scenarios like card reader failure, cash dispenser malfunction, network connectivity issues, etc.

• Simulate card reader failure by inserting a damaged card or a card with a magnetic strip issue.

• Test cash dispenser malfunction by requesting cash withdrawal and observing if the correct amount is dispensed.

• Check for network connectivity issues by trying to access online banking services or performing transactions.

• Test keypad functionality by ...read more

MVVM is a design pattern used in Android development to separate the UI logic from the business logic.

• MVVM stands for Model-View-ViewModel

• Model represents the data and business logic

• View is the UI component that displays the data

• ViewModel acts as a mediator between the Model and View, handling the UI logic and data manipulation

• MVVM helps in maintaining a clean and organized codebase

Find and print the missing number in a given array of strings.

• Convert the array of strings to an array of integers for easier manipulation.

• Iterate through the array to find the missing number by comparing consecutive elements.

• Print the missing number once found.

OOPs stands for Object-Oriented Programming. It is based on four main pillars: Inheritance, Encapsulation, Abstraction, and Polymorphism.

• Inheritance: Allows a class to inherit properties and behavior from another class. Example: class B extends class A.

• Encapsulation: Bundling data and methods that operate on the data into a single unit. Example: using private access modifiers to restrict access to certain data.

• Abstraction: Hiding the complex implementation details and showing...read more