10+ Onestrategy Websolutions Interview Questions and Answers

You can turn on one switch for a few minutes, turn it off and turn on another switch. The remaining switch will be for the third bulb.

• Turn on switch 1 and leave it on for a few minutes

• Turn off switch 1 and turn on switch 2

• Leave switch 2 on for a few minutes

• Turn off switch 2 and turn on switch 3

• The bulb that is off and warm to the touch is connected to switch 1

• The bulb that is on is connected to switch 2

• The bulb that is off and cold to the touch is connected to switch 3

Cake can be cut into 8 equal pieces by making 3 cuts.

• Make two cuts to divide the cake into quarters, then make a third cut through all quarters to get 8 equal pieces.

• Each cut should be made perpendicular to the previous cut.

• The size of the cake does not matter as long as it is a cylindrical or rectangular shape.

Singleton design pattern ensures only one instance of a class is created and provides a global point of access to it.

• Create a private constructor to prevent direct instantiation of the class

• Create a private static instance of the class

• Create a public static method to access the instance

• Ensure thread safety by using synchronized keyword or static initialization block

• Example: Database connection manager

Sort a list of alphanumeric values.

• Use a sorting algorithm to sort the array of strings.

• If the values are case-insensitive, convert them to lowercase before sorting.

• If the values contain numbers, use a natural sorting algorithm to sort them.

• If the values contain special characters, consider their ASCII values while sorting.

Reverse a linked list

• Iteratively swap the next and previous pointers of each node

• Recursively swap the next and previous pointers of each node

• Use a stack to push each node and then pop them to create the reversed list

An immutable class is a class whose instances cannot be modified after creation.

• Make all fields private and final

• Do not provide any setters

• Make the class final so that it cannot be subclassed

• If any mutable object is used as a field, return a copy of it instead of the original object

A Python list is implemented as a dynamic array that can resize itself as needed.

• Python lists are implemented as dynamic arrays, allowing for efficient insertion and deletion operations.

• Lists in Python can hold elements of different data types.

• Lists can be accessed using index values, starting from 0.

• Example: my_list = [1, 'hello', True]

Exception handling is a mechanism to handle runtime errors in a program to prevent it from crashing.

• Exceptions are objects that represent errors or unexpected events in a program.

• Try block is used to enclose the code that might throw an exception.

• Catch block is used to handle the exception if it occurs.

• Finally block is used to execute code regardless of whether an exception is thrown or not.

• Throw keyword is used to manually throw an exception.

• Example: try { // code that might...read more

Oops concept stands for Object-Oriented Programming. It is a programming paradigm based on the concept of objects.

• Oops concept involves the use of classes and objects

• It emphasizes on encapsulation, inheritance, polymorphism, and abstraction

• Encapsulation is the bundling of data with the methods that operate on that data

• Inheritance allows a class to inherit properties and behavior from another class

• Polymorphism allows objects to be treated as instances of their parent class

• Abst...read more

Deliver a presentation for an hour

• Start with an engaging introduction to grab the audience's attention

• Organize the content into clear sections with key points

• Use visuals like slides or props to enhance understanding

• Encourage audience participation through questions or activities

• Conclude with a summary of key takeaways and open the floor for questions