☕ Java Problem Solving for Test Automation Engineers | 55+ Java Coding Interview Programs | Core Java for SDET & QA Automation

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📌 Project Overview

Strong Java programming skills are the foundation of every successful QA Automation Engineer and SDET.

Before building Selenium, Playwright, Appium, REST Assured, or TestNG automation frameworks, engineers must master problem-solving using Core Java.

This repository contains 55+ carefully selected Java programming problems frequently asked during interviews for:

• QA Automation Engineer
• SDET
• Software Development Engineer in Test
• Automation Test Engineer
• Java Developer
• Software Engineer

Each Java program is implemented with clean, easy-to-understand code to strengthen logical thinking and coding fundamentals required for enterprise automation frameworks.

GitHub Repository

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

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🏷️ Repository Tags

JAVA

CORE JAVA

PROBLEM SOLVING

CODING INTERVIEW

SDET

QA AUTOMATION

SELENIUM

PLAYWRIGHT

APPIUM

TESTNG

PROGRAMMING

INTERVIEW PREPARATION

AUTOMATION ENGINEER

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🎯 Repository Objective

Automation Engineers write code every day.

This repository focuses on strengthening programming skills required to:

• Build scalable automation frameworks

• Solve coding interview questions

• Improve logical thinking

• Master Java fundamentals

• Write clean and reusable automation code

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📚 Topics Covered

🔤 String Programming

• Reverse String

• Palindrome String

• Anagram String

• Duplicate Characters

• Character Frequency

• Count Words

• Remove Whitespaces

• Remove Special Characters

• String Length

• Position of Word

• Reverse Words

• Vowel Identification

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🔢 Number Programming

• Armstrong Number

• Prime Number

• Fibonacci Series

• Factorial

• Leap Year

• Even & Odd

• Positive / Negative Number

• Reverse Number

• Sum of Digits

• Sum of Natural Numbers

• Quotient & Remainder

• Random Numbers

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📊 Array Programming

• Missing Number

• Duplicate Elements

• Array Equality

• Sorting Arrays

• Reverse Array

• Maximum Element

• Minimum Element

• Sum of Elements

• Largest Three Numbers

• Even & Odd Numbers

• Linear Search

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🔁 Recursion

• Recursive Factorial

• Recursive Problem Solving

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🔠 Character Operations

• ASCII Values

• Alphabet Check

• Alphabet vs Vowel

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🎨 Pattern Programming

• Triangle Pattern

• Inverted Triangle

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⚙️ Java Fundamentals

• Variables

• Loops

• Conditional Statements

• Input Handling

• Data Types

• Operators

• Random Utilities

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📂 Repository Structure

Java-Problem-Solving-For-Test-Automation-Engineers-Part-I
│
├── eclipse-workspace
│
└── JavaProgrammingInterviewQuestionPractice
│
└── src
│
├── String Programs
├── Number Programs
├── Array Programs
├── Pattern Programs
├── Character Programs
└── Utility Programs

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💼 Skills Demonstrated

This repository demonstrates practical understanding of:

• Core Java

• Problem Solving

• Algorithmic Thinking

• Programming Logic

• String Manipulation

• Array Operations

• Mathematical Programming

• Recursion

• Conditional Logic

• Looping Constructs

• Interview Coding

• Automation Engineering Fundamentals

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🛠 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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🚀 Why This Repository Matters

Automation Engineers spend much more time writing Java code than simply writing Selenium scripts.

This repository demonstrates the programming foundation needed to build:

• Selenium Frameworks

• Playwright Frameworks

• REST Assured Automation

• Appium Frameworks

• TestNG Projects

• Enterprise Automation Solutions

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📈 What Recruiters Will Find

This project showcases practical skills in:

✅ Core Java Programming

✅ Programming Logic

✅ Problem Solving

✅ Interview Preparation

✅ Automation Engineering Fundamentals

✅ Code Organization

✅ Clean Java Implementation

These are essential skills expected from QA Automation Engineers and SDETs working on enterprise automation projects.

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🎯 Ideal Audience

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 Selenium interviews

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📖 Sample Interview Problems Included

Some of the coding problems implemented include:

• Reverse a String

• Palindrome String

• Prime Number

• Fibonacci Series

• Armstrong Number

• Array Equality

• Missing Number

• Duplicate Characters

• Reverse Array

• Factorial using Recursion

• Sorting Arrays

• Character Frequency

• Remove Whitespaces

• Remove Special Characters

• Swap Variables

• Pattern Printing

...and many more.

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🚀 Learning Outcomes

After exploring this repository, you will be able to:

• Improve Java coding skills

• Solve common interview problems

• Build strong programming fundamentals

• Prepare for SDET interviews

• Write cleaner automation code

• Strengthen logical reasoning

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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 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 useful, please consider giving it a Star ⭐.

Your support motivates me to continue building and sharing enterprise-level QA Automation, Java, and SDET learning resources.

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💡 "Strong automation engineers are built on strong programming fundamentals. Every framework begins with problem-solving."