Ejemplo de singleton generico

Author: simonguzman

Roadmap/23 - SINGLETON/java/simonguzman.java

@@ -0,0 +1,29 @@
+public class simonguzman {
+    public static void main(String[] args) {
+        genericSingleton();
+    }
+
+    public static void genericSingleton(){
+        Singleton singleton = Singleton.getInstance();
+        singleton.showMessage();
+    }
+
+    public static class Singleton{
+        private static Singleton instance;
+
+        private Singleton(){
+
+        }
+
+        public static Singleton getInstance(){
+            if(instance == null){
+                instance = new Singleton();
+            }
+            return instance;
+        }
+
+        public static void showMessage(){
+            System.out.println("Soy un Singleton.");
+        }
+    }
+}