asmhatre/design-patterns
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

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

Browse Source
This commit is contained in:
Ankur
2026-06-24 17:28:20 +05:30
parent 09a7b69d89
commit 46c6ba133c
2 changed files with 52 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
03-behavioral/strategy/README.md Normal file
View File

@@ -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/

19
README.md
View File

@@ -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