ADD file via upload

ConcreteProductA.java

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+public class ConcreteProductA implements Product {
+    @Override
+    public void operation() {
+        System.out.println("ConcreteProductA operation");
+    }
+}

scr

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+public class Factory {
+    public static Product createProduct(String type) {
+        if (type == null) {
+            return null;
+        }
+        if (type.equalsIgnoreCase("A")) {
+            return new ConcreteProductA();
+        } else if (type.equalsIgnoreCase("B")) {
+            return new ConcreteProductB();
+        }
+        return null;
+    }
+}