first version of pattern without Tests

extension-objects/src/main/java/concreteextensions/Commander.java

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+package concreteextensions;
+
+import abstractextensions.CommanderExtension;
+import units.CommanderUnit;
+
+/**
+ * Created by Srdjan on 27-Apr-17.
+ */
+public class Commander implements CommanderExtension {
+
+  private CommanderUnit unit;
+
+  public Commander(CommanderUnit commanderUnit) {
+    this.unit = commanderUnit;
+  }
+}

extension-objects/src/main/java/concreteextensions/Sergeant.java

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+package concreteextensions;
+
+import abstractextensions.SergeantExtension;
+import units.SergeantUnit;
+
+/**
+ * Created by Srdjan on 27-Apr-17.
+ */
+public class Sergeant implements SergeantExtension {
+
+  private SergeantUnit unit;
+
+  public Sergeant(SergeantUnit sergeantUnit) {
+    this.unit = sergeantUnit;
+  }
+
+  @Override
+  public void sergeantReady() {
+    System.out.println("[Sergeant] " + unit.getName() + " do command! ");
+  }
+}

extension-objects/src/main/java/concreteextensions/Soldier.java

@@ -0,0 +1,21 @@
+package concreteextensions;
+
+import abstractextensions.SoldierExtension;
+import units.SoldierUnit;
+
+/**
+ * Created by Srdjan on 26-Apr-17.
+ */
+public class Soldier implements SoldierExtension {
+
+  private SoldierUnit unit;
+
+  public Soldier(SoldierUnit soldierUnit) {
+    this.unit = soldierUnit;
+  }
+
+  @Override
+  public void soldierReady() {
+    System.out.println("[Solider] " + unit.getName() + "  do command");
+  }
+}