Add all 23 GoF design pattern implementations (2026-06-13)

03-behavioral/strategy/Sorter.java

@@ -0,0 +1,24 @@
+package strategy;
+
+import java.util.Arrays;
+
+/**
+ * Context — uses a SortStrategy. The strategy can be swapped at runtime.
+ * Sorter doesn't care which algorithm is used; it just calls sort().
+ */
+public class Sorter {
+    private SortStrategy strategy;
+
+    public Sorter(SortStrategy strategy) { this.strategy = strategy; }
+
+    public void setStrategy(SortStrategy strategy) {
+        System.out.println("  Switching to: " + strategy.getName());
+        this.strategy = strategy;
+    }
+
+    public int[] sort(int[] data) {
+        int[] copy = Arrays.copyOf(data, data.length);
+        strategy.sort(copy);
+        return copy;
+    }
+}