Java-Refactoring-Extract-Method
Java-Refactoring-Extract-Method是一款code方向的AI技能，核心价值是Refactoring using Extract Methods in Java Language，可用于解决开发者在code领域的实际问题，帮助用户提升效率、自动化重复任务或优化工作流。
Refactoring using Extract Methods in Java Language
mkdir -p ./skills/java-refactoring-extract-method && curl -sfL https://raw.githubusercontent.com/github/awesome-copilot/main/skills/java-refactoring-extract-method/SKILL.md -o ./skills/java-refactoring-extract-method/SKILL.mdRun in terminal / PowerShell. Requires curl (Unix) or PowerShell 5+ (Windows).
Skill Content
# Refactoring Java Methods with Extract Method
Role
You are an expert in refactoring Java methods.
Below are **2 examples** (with titles code before and code after refactoring) that represents **Extract Method**.
Code Before Refactoring 1:
public FactLineBuilder setC_BPartner_ID_IfValid(final int bpartnerId) {
assertNotBuild();
if (bpartnerId > 0) {
setC_BPartner_ID(bpartnerId);
}
return this;
}Code After Refactoring 1:
public FactLineBuilder bpartnerIdIfNotNull(final BPartnerId bpartnerId) {
if (bpartnerId != null) {
return bpartnerId(bpartnerId);
} else {
return this;
}
}
public FactLineBuilder setC_BPartner_ID_IfValid(final int bpartnerRepoId) {
return bpartnerIdIfNotNull(BPartnerId.ofRepoIdOrNull(bpartnerRepoId));
}Code Before Refactoring 2:
public DefaultExpander add(RelationshipType type, Direction direction) {
Direction existingDirection = directions.get(type.name());
final RelationshipType[] newTypes;
if (existingDirection != null) {
if (existingDirection == direction) {
return this;
}
newTypes = types;
} else {
newTypes = new RelationshipType[types.length + 1];
System.arraycopy(types, 0, newTypes, 0, types.length);
newTypes[types.length] = type;
}
Map<String, Direction> newDirections = new HashMap<String, Direction>(directions);
newDirections.put(type.name(), direction);
return new DefaultExpander(newTypes, newDirections);
}Code After Refactoring 2:
public DefaultExpander add(RelationshipType type, Direction direction) {
Direction existingDirection = directions.get(type.name());
final RelationshipType[] newTypes;
if (existingDirection != null) {
if (existingDirection == direction) {
return this;
}
newTypes = types;
} else {
newTypes = new RelationshipType[types.length + 1];
System.arraycopy(types, 0, newTypes, 0, types.length);
newTypes[types.length] = type;
}
Map<String, Direction> newDirections = new HashMap<String, Direction>(directions);
newDirections.put(type.name(), direction);
return (DefaultExpander) newExpander(newTypes, newDirections);
}
protected RelationshipExpander newExpander(RelationshipType[] types,
Map<String, Direction> directions) {
return new DefaultExpander(types, directions);
}Task
Apply **Extract Method** to improve readability, testability, maintainability, reusability, modularity, cohesion, low coupling, and consistency.
Always return a complete and compilable method (Java 17).
Perform intermediate steps internally:
- First, analyze each method and identify those exceeding thresholds:
* LOC (Lines of Code) > 15
* NOM (Number of Statements) > 10
* CC (Cyclomatic Complexity) > 10
- For each qualifying method, identify code blocks that can be extracted into separate methods.
- Extract at least one new method with a descriptive name.
- Output only the refactored code inside a single ```java``` block.
- Do not remove any functionality from the original method.
- Include a one-line comment above each new method describing its purpose.
Code to be Refactored:
Now, assess all methods with high complexity and refactor them using **Extract Method**
🎯 Best For
- Tech leads planning refactors
- Developers modernizing legacy code
- Claude users
- GitHub Copilot users
- Software engineers
💡 Use Cases
- Migrating from class components to hooks
- Breaking apart monolithic functions
- Code quality improvement
- Best practice enforcement
📖 How to Use This Skill
- 1
Install the Skill
Copy the install command from the Terminal tab and run it. The SKILL.md file downloads to your local skills directory.
- 2
Load into Your AI Assistant
Open Claude or GitHub Copilot and reference the skill. Paste the SKILL.md content or use the system prompt tab.
- 3
Apply Java-Refactoring-Extract-Method to Your Work
Open your project in the AI assistant and ask it to apply the skill. Start with a small module to verify the output quality.
- 4
Review and Refine
Review AI suggestions before committing. Run tests, check for regressions, and iterate on the skill output.
❓ Frequently Asked Questions
Does this handle breaking changes?
Refactoring skills identify breaking changes but always run your test suite after applying suggestions.
Is Java-Refactoring-Extract-Method compatible with Cursor and VS Code?
Yes — this skill works with any AI coding assistant including Cursor, VS Code with Copilot, and JetBrains IDEs.
Do I need specific dependencies for Java-Refactoring-Extract-Method?
Check the install command and Works With section. Most code skills only require the AI assistant and your codebase.
How do I install Java-Refactoring-Extract-Method?
Copy the install command from the Terminal tab and run it. The skill downloads to ./skills/java-refactoring-extract-method/SKILL.md, ready to use.
Can I customize this skill for my team?
Absolutely. Edit the SKILL.md file to add team-specific instructions, examples, or workflows.
⚠️ Common Mistakes to Avoid
Refactoring without tests
Never refactor critical paths without a comprehensive test suite to catch regressions.
Skipping validation
Always test AI-generated code changes, even for simple refactors.
Missing dependency updates
Check if the skill requires updated dependencies or new packages.