DSA, OOP, Lambdas and Streams, and Coding Challenges in Java

This repository contains programs related to Data Structures and Algorithms (DSA) in Java, Object-Oriented Programming (OOP) examples, usage of Lambdas and Streams, and various coding challenges that I have tackled. The aim is to provide a comprehensive learning resource for these concepts implemented in Java.

Contents

• Data Structures and Algorithms
• Object-Oriented Programming in Java
• Lambdas and Streams
• Generics
• Unit Testing
• Coding Challenges

Data Structures and Algorithms

Below are some of the DSA concepts implemented in Java:

1. Euclidean Algorithm
2. Bubble Sort Algorithm

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Object-Oriented Programming in Java

Abstraction

Abstract Methods

• Recipe Book Example
• Animals Example (Dogs and Cats)

Interfaces

• Gaming Console (Chess and Mario)
• Playing with Numbers (Multiplication and Addition)
• Flyable (Objects that can Fly)

Composition

• Books Extended Example
• Customers Class with an Address

Polymorphism

• Doctor Example (Practitioner and Surgeon)

Inheritance

• Extending Person class (Student and Employee)
• Extending ArrayList for Push and Pop

General Examples (Using Encapsulation)

• Book Store
• Motor-Bike
• Features of a Character
• Operations on Two Numbers
• Calculating Simple Interest
• Operations on Number Extended
• Student Class
• Properties of Rectangle
• Properties of a Fan

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Lambdas and Streams

• Creating Interfaces for Streams
• Built-in Interface for Streams
• Streams Using Lambdas
• Over-riding Comparable and Comparator for Sorting
• Stream Examples

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Generics

• Creating a Custom List
• Generic Methods
• Wild Cards (LowerBound and UpperBound)

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Unit Testing

Calculator

• Calculator Class
• Testing of Calculator

Hello World

• Hello World Class
• Testing of Hello World

Bank Account

• Bank Account Class
• Testing of Bank Account (Comprehensive)
• Testing of Bank Account (Ordered Tests)

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Coding Challenges

Challenges that showcase problem-solving using Java:

1. Check if a number is Odd or Even
2. Password Complexity Checker
3. Double or Nothing Game
4. Calculate Water Bill
5. Create a Model of a Person Class
6. Get Date after X Days
7. Identify Students with Less than 2 Attendances at Volunteering
8. Letter Points Challenge
9. Find the Least Expensive Item in a Store

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Contributing

I welcome contributions to this repository! If you have suggestions for improving the game or have found a way to beat the current record, please feel free to contribute. Here's how you can do so:

1. Fork the repository.
2. Create a new branch (git checkout -b <branch_name>).
3. Commit your changes (git commit -m 'Added some features...').
4. Push to the branch (git push origin <branch_name>).
5. Open a pull request.

For any queries or suggestions, feel free to open an issue in the repository.