☕ Java Problem Solving for Test Automation Engineers – Part II | 45+ Advanced Java Coding Programs | Core Java for SDET & QA Automation

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📌 Project Overview

Strong automation engineers are strong programmers first.

This repository is the second part of my Java Problem Solving series and contains 45+ advanced Java programming exercises focused on logical thinking, collections, sorting algorithms, matrix operations, recursion, string manipulation, and interview-oriented coding challenges.

These programs strengthen the Java fundamentals required for building scalable automation frameworks using Selenium, Playwright, Appium, REST Assured, TestNG, and Cucumber.

Whether you're preparing for an SDET interview or improving your Core Java skills, this repository provides practical coding exercises commonly asked in technical interviews.

GitHub Repository

🔗 https://github.com/ArpitChoubey/Java-Problem-Solving-For-Test-Automation-Engineers-Part-II

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🏷️ Repository Tags

JAVA

CORE JAVA

PROBLEM SOLVING

CODING INTERVIEW

AUTOMATION TESTING

SDET

QA AUTOMATION

COLLECTIONS

ARRAYS

STRINGS

ALGORITHMS

INTERVIEW PREPARATION

JAVA PROGRAMS

SOFTWARE ENGINEERING

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🎯 Repository Objective

Modern QA Automation Engineers write production-quality Java code—not just Selenium scripts.

This repository focuses on developing the programming skills required to:

• Improve logical thinking

• Solve coding interview problems

• Master Java Collections

• Strengthen algorithmic problem solving

• Prepare for Automation Engineer & SDET interviews

• Build scalable automation frameworks

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📚 Topics Covered

🔤 String Programming

• Reverse String

• Reverse Words

• Remove Vowels

• Replace Vowels

• Longest Common Prefix

• String Rotation

• String to Integer

• Manual trim()

• Character Frequency

• Unique Characters

• Digit Validation

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📊 Array Programming

• Bubble Sort

• Selection Sort

• Insertion Sort

• Rotate Array

• Merge Arrays

• Move Zeroes

• Remove Negative Numbers

• Sort String Arrays

• Matrix Operations

• Matrix Transpose

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📦 Java Collections Framework

• ArrayList

• LinkedList

• HashMap

• HashSet

• Arrays.asList()

• Collections Sorting

• List Reversal

• Duplicate Detection

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🔢 Mathematical Programming

• Binary to Decimal

• GCD

• LCM

• Count Set Bits

• FizzBuzz

• Calculator

• Pascal Triangle

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🔁 Recursion

• Print Numbers Using Recursion

• Recursive Programming Logic

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⭐ Pattern Programming

• Rectangle Pattern

• Star Patterns

• Number Patterns

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🧠 Data Structure Concepts

• Stack

• HashMap

• LinkedList

• Matrix

• Arrays

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📂 Repository Structure

Java-Problem-Solving-For-Test-Automation-Engineers-Part-II
│
├── eclipse-workspace
│
└── JavaProgrammingIQPartTwo
│
└── src
│
├── Array Programs
├── Collection Programs
├── String Programs
├── Matrix Programs
├── Sorting Algorithms
├── Mathematical Programs
├── Pattern Programs
└── Utility Programs

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💼 Skills Demonstrated

This repository showcases practical knowledge of:

• Core Java

• Object-Oriented Programming

• Java Collections Framework

• Programming Logic

• Algorithm Design

• String Manipulation

• Array Operations

• Matrix Operations

• Sorting Algorithms

• Recursion

• Interview Coding

• Clean Code Practices

---

🛠 Technology Stack

Category	Technology
Programming Language	Java
IDE	Eclipse
Version Control	Git
Repository	GitHub
Concepts	Core Java
Focus Area	Problem Solving

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🚀 Featured Programming Problems

Some of the interview-focused programs included are:

• Bubble Sort

• Selection Sort

• Insertion Sort

• Balanced Parentheses

• Binary to Decimal

• String Rotation

• Longest Common Prefix

• Array Rotation

• Matrix Transpose

• HashMap Examples

• LinkedList Operations

• ArrayList Operations

• Remove Vowels

• Reverse Words

• Pascal Triangle

• FizzBuzz

• GCD & LCM

• Count Set Bits

• Move Zeroes

• Duplicate Detection

• Character Frequency

• Calculator

...and many more.

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🎯 Why This Repository Matters

Automation Engineers frequently face Java coding rounds before framework or Selenium discussions.

This repository demonstrates programming skills expected for roles involving:

• Selenium WebDriver

• Playwright

• Appium

• REST Assured

• TestNG

• Cucumber

• Enterprise Automation Framework Development

Strong Core Java knowledge is essential for writing maintainable, reusable, and scalable automation code.

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📈 Learning Outcomes

After completing these programs, you will gain practical experience in:

✅ Java Programming

✅ Collections Framework

✅ Problem Solving

✅ Coding Interview Preparation

✅ Automation Engineering Fundamentals

✅ Algorithmic Thinking

✅ Clean Coding Practices

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🎯 Ideal For

This repository is useful for:

• QA Engineers

• Automation Test Engineers

• SDETs

• Java Developers

• Software Engineers

• Manual Testers transitioning to Automation

• Freshers preparing for coding interviews

• Professionals preparing for Java & Selenium interviews

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💼 Why Recruiters Should Explore This Repository

This project demonstrates:

• Strong Core Java fundamentals

• Advanced problem-solving ability

• Knowledge of Java Collections Framework

• Understanding of algorithms and data structures

• Interview-focused coding skills

• Programming discipline required for enterprise automation

These capabilities are highly valued in QA Automation Engineer, SDET, and Software Engineer roles where programming is a core expectation.

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👨‍💻 About the Author

Arpit Choubey

SDET | QA Automation Engineer | Selenium | Playwright | Appium | REST Assured | Java | SQL | Docker | Jenkins | AI Testing

Passionate about solving programming challenges, designing scalable automation frameworks, and sharing practical learning resources for the QA community.

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🌐 Connect With Me

GitHub

https://github.com/ArpitChoubey

LinkedIn

https://www.linkedin.com/in/arpitchoubey/

Medium

https://medium.com/@ArpitChoubey9

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⭐ Support

If you found this repository helpful, please consider giving it a Star ⭐.

Your support motivates me to continue sharing enterprise-grade Java, QA Automation, and SDET learning resources with the community.

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💡 "Great automation frameworks are built by engineers with strong programming fundamentals. Every coding problem solved today becomes a building block for tomorrow's enterprise automation solution."