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Visitor: sync post code blocks to repo exactly (post used a completely different design - return-value visitors vs repo's void/print-in-place visitors, different Triangle model), split merged Circle/Rectangle/Triangle and AreaCalculator/PerimeterCalculator blocks, Java 25, H6 file labels, fix stale console output, README mapping

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Ankur
2026-06-24 17:36:10 +05:30
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@@ -460,6 +460,25 @@ javac 03-behavioral/template-method/*.java -d out/template-method
java -cp out/template-method template.Main
```
### Visitor (`03-behavioral/visitor/`)
| Post Section | File(s) |
|---|---|
| Implementation: Shape Geometry Operations — the Visitor interface | `ShapeVisitor.java` |
| Implementation: Shape Geometry Operations — the Element interface | `Shape.java` |
| Implementation: Shape Geometry Operations — Circle | `Circle.java` |
| Implementation: Shape Geometry Operations — Rectangle | `Rectangle.java` |
| Implementation: Shape Geometry Operations — Triangle | `Triangle.java` |
| Implementation: Shape Geometry Operations — AreaCalculator | `AreaCalculator.java` |
| Implementation: Shape Geometry Operations — PerimeterCalculator | `PerimeterCalculator.java` |
| Implementation: Shape Geometry Operations — wiring it together | `Main.java` |
Run it:
```bash
javac 03-behavioral/visitor/*.java -d out/visitor
java -cp out/visitor visitor.Main
```
## Reference
- *Design Patterns: Elements of Reusable Object-Oriented Software* — Gamma, Helm, Johnson, Vlissides