#23 - Java

Roadmap/23 - SINGLETON/java/Josegs95.java

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+public class Josegs95 {
+    public static void main(String[] args) {
+        //Ejercicio
+        Singleton s1 = Singleton.getInstance("1");
+        Singleton s2 = Singleton.getInstance("2");
+
+        System.out.println("Si tienen el mismo 'id', es la misma instancia:");
+        System.out.println(s1.getId());
+        System.out.println(s2.getId());
+
+        //Reto
+        retoFinal();
+    }
+
+    public static void retoFinal(){
+        Session session1 = Session.getInstance();
+        session1.setUser("1", "Josegs95", "Jose", "[email protected]");
+
+        System.out.println(session1);
+
+        Session session2 = Session.getInstance();
+
+        System.out.println(session2);
+
+        session2.clear();
+
+        System.out.println(session1);
+    }
+
+    public static class Singleton{
+        private static Singleton instance;
+        private String id;
+
+        private Singleton(String id){
+            this.id = id;
+        }
+
+        public static Singleton getInstance(String id){
+            if (instance == null)
+                instance = new Singleton(id);
+            return instance;
+        }
+
+        public String getId(){
+            return id;
+        }
+    }
+
+    public static class Session{
+        private static Session session;
+        private String id;
+        private String username;
+        private String name;
+        private String email;
+
+        private Session() {}
+
+        public static Session getInstance(){
+            if (session == null)
+                session = new Session();
+            return session;
+        }
+
+        public void setUser(String id, String username, String name, String email){
+            this.id = id;
+            this.username = username;
+            this.name = name;
+            this.email = email;
+        }
+
+        public String getId() {
+            return id;
+        }
+
+        public String getUsername() {
+            return username;
+        }
+
+        public String getName() {
+            return name;
+        }
+
+        public String getEmail() {
+            return email;
+        }
+
+        public void clear(){
+            id = null;
+            username = null;
+            name = null;
+            email = null;
+        }
+
+        @Override
+        public String toString() {
+            return "[" + id + ", " + username + ", " + name + ", " + email + "]";
+        }
+    }
+}