diff --git a/Roadmap/27 - SOLID OCP/java/martinbohorquez.java b/Roadmap/27 - SOLID OCP/java/martinbohorquez.java
new file mode 100644
index 0000000000..9eddeca63d
--- /dev/null
+++ b/Roadmap/27 - SOLID OCP/java/martinbohorquez.java	
@@ -0,0 +1,164 @@
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * #27 SOLID: PRINCIPIO ABIERTO-CERRADO (OCP)
+ *
+ * @author martinbohorquez
+ */
+public class martinbohorquez {
+    public static void main(String[] args) {
+        drawFormaTest();
+        drawFormOCPTest();
+
+        /*
+         * DIFICULTAD EXTRA
+         */
+        calculatorOCPTest();
+
+    }
+
+    private static void drawFormaTest() {
+        Forma forma = new Forma();
+        forma.drawSquare();
+        forma.drawCircle();
+        forma.drawTriangle();
+    }
+
+    private static void drawFormOCPTest() {
+        Form square = new Square();
+        square.draw();
+        Form circle = new Circle();
+        circle.draw();
+        Form triangle = new Triangle();
+        triangle.draw();
+    }
+
+    static class Forma {
+        private void drawSquare() {
+            System.out.println("Dibuja un cuadrado!");
+        }
+
+        private void drawCircle() {
+            System.out.println("Dibuja un círculo!");
+        }
+
+        private void drawTriangle() {
+            System.out.println("Dibuja un triángulo!");
+        }
+    }
+
+    interface Form {
+        void draw();
+    }
+
+    static class Square implements Form {
+
+        @Override
+        public void draw() {
+            System.out.println("Dibuja un cuadrado!");
+        }
+    }
+
+    static class Circle implements Form {
+
+        @Override
+        public void draw() {
+            System.out.println("Dibuja un círculo!");
+        }
+    }
+
+    static class Triangle implements Form {
+
+        @Override
+        public void draw() {
+            System.out.println("Dibuja un triángulo!");
+        }
+    }
+
+    private static void calculatorOCPTest() {
+        Calculator calculator = new Calculator();
+        calculator.addOperation("addition", new Addition());
+        calculator.addOperation("subtraction", new Subtraction());
+        calculator.addOperation("multiplication", new Multiplication());
+        calculator.addOperation("division", new Division());
+        calculator.addOperation("power", new Power());
+
+        calculator.calculate("addition", 10, 5);
+        calculator.calculate("subtraction", 10, 5);
+        calculator.calculate("multiplication", 10, 5);
+        calculator.calculate("division", 10, 2.5);
+        calculator.calculate("power", 5, 3);
+
+    }
+
+    interface Operation {
+        double execute(double a, double b);
+    }
+
+    static class Addition implements Operation {
+
+        @Override
+        public double execute(double a, double b) {
+            return a + b;
+        }
+    }
+
+    static class Subtraction implements Operation {
+
+        @Override
+        public double execute(double a, double b) {
+            return a - b;
+        }
+    }
+
+    static class Multiplication implements Operation {
+
+        @Override
+        public double execute(double a, double b) {
+            return a * b;
+        }
+    }
+
+    static class Division implements Operation {
+
+        @Override
+        public double execute(double a, double b) {
+            return a / b;
+        }
+    }
+
+    static class Power implements Operation {
+
+        @Override
+        public double execute(double a, double b) {
+            return Math.pow(a, b);
+        }
+    }
+
+    static class Calculator {
+        List<Map<String, Operation>> operations;
+
+        public Calculator() {
+            operations = new ArrayList<>();
+        }
+
+        private void addOperation(String name, Operation operation) {
+            Map<String, Operation> operationMap = new HashMap<>();
+            operationMap.put(name, operation);
+            operations.add(operationMap);
+        }
+
+        private void calculate(String name, double a, double b) {
+            operations.stream()
+                    .filter(o -> o.containsKey(name))
+                    .findFirst()
+                    .ifPresentOrElse(operation ->
+                                    System.out.printf("%s de %.1f y %.1f: %.2f%n",
+                                            name, a, b, operation.get(name).execute(a, b)),
+                            () -> System.out.printf("La operación '%s' no está soportada", name));
+        }
+    }
+}