Strategy: sync post code blocks to repo exactly, split merged BubbleSort/MergeSort/QuickSort block (fixing non-compiling stub methods), Java 25, H6 file labels, fix stale console output, README mapping

03-behavioral/strategy/README.md

@@ -0,0 +1,33 @@
+# Strategy Design Pattern — Java Example
+
+**Pattern:** Behavioral → Strategy
+**Article:** https://ankurm.com/strategy-design-pattern-java/
+
+## What this example shows
+
+Three sorting algorithms behind one interface, swappable at runtime. `SortStrategy` declares `sort()` and `getName()`. `BubbleSort`, `MergeSort`, and `QuickSort` each implement the full algorithm — not stubs, the real divide-and-conquer and partition logic. `Sorter` is the context: it holds whichever strategy is active and copies the input array before sorting so callers can compare results without mutating their data. `Main` sorts the same array with all three strategies in turn, then simulates choosing a strategy based on input size.
+
+## How to run
+
+```bash
+javac strategy/*.java -d out/strategy
+java -cp out/strategy strategy.Main
+```
+
+Requires Java 25.
+
+## Post Section ↔ File Mapping
+
+| Post Section | File(s) |
+|---|---|
+| Implementation: Pluggable Sorting — the Strategy interface | `SortStrategy.java` |
+| Implementation: Pluggable Sorting — BubbleSort | `BubbleSort.java` |
+| Implementation: Pluggable Sorting — MergeSort | `MergeSort.java` |
+| Implementation: Pluggable Sorting — QuickSort | `QuickSort.java` |
+| Implementation: Pluggable Sorting — the Context (Sorter) | `Sorter.java` |
+| Implementation: Pluggable Sorting — wiring it together | `Main.java` |
+
+Note: the "Strategy in Java 8+: Lambdas as Strategies" snippet (`Comparator`/lambda example) is illustrative only — it is not part of this repository's runnable example.
+
+Article: https://ankurm.com/strategy-design-pattern-java/
+All patterns: https://ankurm.com/design-patterns-java/

README.md

@@ -426,6 +426,25 @@ javac 03-behavioral/state/*.java -d out/state
 java -cp out/state state.Main
 ```
 
+### Strategy (`03-behavioral/strategy/`)
+
+| Post Section | File(s) |
+|---|---|
+| Implementation: Pluggable Sorting — the Strategy interface | `SortStrategy.java` |
+| Implementation: Pluggable Sorting — BubbleSort | `BubbleSort.java` |
+| Implementation: Pluggable Sorting — MergeSort | `MergeSort.java` |
+| Implementation: Pluggable Sorting — QuickSort | `QuickSort.java` |
+| Implementation: Pluggable Sorting — the Context (Sorter) | `Sorter.java` |
+| Implementation: Pluggable Sorting — wiring it together | `Main.java` |
+
+Note: the "Strategy in Java 8+: Lambdas as Strategies" snippet is illustrative only — it is not part of this repository's runnable example.
+
+Run it:
+```bash
+javac 03-behavioral/strategy/*.java -d out/strategy
+java -cp out/strategy strategy.Main
+```
+
 ## Reference
 
 - *Design Patterns: Elements of Reusable Object-Oriented Software* — Gamma, Helm, Johnson, Vlissides