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TRAINING PROJECT
Java debugging & refactor (Heme Biotech)
Debugging and fixing a Java application for medical needs prediction at Hemebiotech.
Context
Heme Biotech is a pharmaceutical company specializing in blood disorders. Alex, a chemistry researcher, had started a Java program for counting and alphabetically sorting symptoms — but all counters returned 0. Mission: diagnose the bugs, refactor the codebase to Java OOP standards, and deliver full Javadoc documentation for team handover.
Problem Scope
- Symptom counter consistently returning 0 — root cause to be identified
- Sort algorithm broken — output not alphabetical
- Monolithic code with no separation of concerns
- No interfaces or OOP patterns in place
- Naming not compliant with Java camelCase conventions
- No Javadoc documentation available for team handover
Solution & Deliverables
- Replaced data structure with TreeMap — native alphabetical ordering and corrected counting
- Created ISymptomReader and ISymptomWriter interfaces
- Implemented AnalyticsCounter class with 4 methods: getSymptoms, countSymptoms, sortSymptoms, writeSymptoms
- Isolated entry point into a dedicated Main class
- camelCase naming applied throughout the entire codebase
- Full Javadoc on all public methods
- result.out file generated with alphabetically sorted symptoms
Stack & Technologies
- Java 8+ — primary language
- TreeMap — data structure for natural ordering and accurate counting
- Java Interfaces — ISymptomReader, ISymptomWriter
- Javadoc — automated code documentation
- Git — dev → main workflow, atomic commits per step
- IntelliJ IDEA — development environment
Project Timeline
- 1Analysis & diagnosisCode review, bug identification (TreeMap logic), mapping of OOP violations
- 2Bug fixReplaced broken counter logic with TreeMap for correct counting and natural ordering
- 3OOP refactorInterfaces created, classes separated, camelCase naming applied throughout
- 4DocumentationFull Javadoc written for all public methods
- 5Validation & deliveryManual testing, result.out generation, defense validated with 2/2 skills
Defense Results
2/2
Skills validated
1 critical
Bugs fixed
4
Classes created
2
Interfaces
HemeBiotech — Java debugging project
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