core-java

Core Java for SDETs and QA

This playbook helps automation engineers revise and strengthen core Java fundamentals required for:

• Selenium framework development
• REST Assured automation
• CI/CD execution
• Interview preparation

This repository is intentionally simple and runnable.

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What you will learn

• Java basics: classes, data types, operators
• Loops and conditions
• Access modifiers
• Exceptions
• Collections (List and Map) for test data
• Maven basics
• Running a simple Selenium-style Java test

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Who this playbook is for

• SDETs with ~3 years experience
• QA Engineers moving into framework design
• Learners preparing for automation interviews

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How to run

Prerequisites

• Java 17+ (or compatible)
• Maven 3.8+
• Git

Check versions:

java -version
mvn -v

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Run sample programs

Compile and run the example programs that demonstrate fundamentals.

cd programs
javac PrepareEnv.java
java PrepareEnv.java

javac RunSample.java
java RunSample.java

Run core Java programs

Compile and run the core Java example programs located in playbook_examples:

# from repo root
cd ..\playbook_examples

# Run the basic demo on Java String, operators and for loop/ while loop located in `playbook_examples`
javac BasicsDemo.java
java BasicsDemo

# Run the operator precedence demo located in `playbook_examples`
javac OperatorsPrecedenceDemo.java
java OperatorsPrecedenceDemo

# Run the Object-Orient Programming (OOP) demo located in `playbook_examples`
javac ClassDemo.java
java ClassDemo.java

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Run Selenium Java test

Compile and run the Selenium Java example program located in playbook_examples:

# from repo root
mvn -v

# Run the stand-alone Selenium Java test on Swag Labs
mvn test

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Notes

• If you plan to run browser-based tests, install browser binaries or use Selenium Manager.
• For CI runs, configure --skip-network or use local mocks/wiremock for stable API tests.

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Learn more

• Core Java Playbook video https://youtu.be/H2Csz1RRTTM
• Java strategies to build Test Automation Frameworks blog post https://inderpsingh.blogspot.com/2026/01/java-automation.html
• If you have any questions, message https://www.linkedin.com/in/inderpsingh/

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