#24 - Java

Author: Josegs95

Roadmap/24 - DECORADORES/java/Josegs95.java

@@ -0,0 +1,82 @@
+public class Josegs95 {
+    public static void main(String[] args) {
+        //Ejercicio
+        //En java es un poco engorroso los decoradores porque necesitas muchas clases
+        //e interfaces para implementar el patrón de diseño
+        Interface instance1 = new DefaultImplClass();
+        System.out.println(instance1.getString());
+
+        Interface instance2 = new Decorator(new DefaultImplClass());
+        System.out.println(instance2.getString());
+
+        //Reto
+        retoFinal();
+    }
+
+    public static void retoFinal(){
+        //Voy a reutilizar la interfaz y las clases usadas en el ejercicio para evitar
+        //crear demasiado código "dummy"
+        Interface instance = new ChallengeDecorator(new DefaultImplClass());
+
+        System.out.println("Veces que se ha llamado a 'getString()': " + ((ChallengeDecorator)instance).getCounter());
+        instance.getString();
+        instance.getString();
+        instance.getString();
+        System.out.println("Veces que se ha llamado a 'getString()': " + ((ChallengeDecorator)instance).getCounter());
+    }
+
+    public interface Interface{
+        String getString();
+    }
+
+    public static class DefaultImplClass implements Interface{
+        @Override
+        public String getString() {
+            return "Cadena por defecto";
+        }
+    }
+
+    public static abstract class BaseDecorator implements Interface{
+        private Interface interfaceInstance;
+
+        public BaseDecorator(Interface interfaceInstance) {
+            this.interfaceInstance = interfaceInstance;
+        }
+
+        @Override
+        public String getString() {
+            return interfaceInstance.getString();
+        }
+    }
+
+    public static class Decorator extends BaseDecorator{
+        public Decorator(Interface interfaceInstance) {
+            super(interfaceInstance);
+        }
+
+        @Override
+        public String getString() {
+            return super.getString() + ", mas la cadena del decorador";
+        }
+    }
+
+    public static class ChallengeDecorator extends BaseDecorator{
+
+        private int counter;
+
+        public ChallengeDecorator(Interface interfaceInstance) {
+            super(interfaceInstance);
+            counter = 0;
+        }
+
+        @Override
+        public String getString() {
+            counter++;
+            return super.getString();
+        }
+
+        public int getCounter() {
+            return counter;
+        }
+    }
+}