create interfacce per visitor e observer

nbproject/private/private.xml

@@ -3,10 +3,15 @@
     <editor-bookmarks xmlns="http://www.netbeans.org/ns/editor-bookmarks/2" lastBookmarkId="0"/>
     <open-files xmlns="http://www.netbeans.org/ns/projectui-open-files/2">
         <group>
+            <file>file:/Users/work/NetBeansProjects/MpProject/src/mpproject/ObserverRegister.java</file>
             <file>file:/Users/work/NetBeansProjects/MpProject/src/mpproject/Player.java</file>
             <file>file:/Users/work/NetBeansProjects/MpProject/src/mpproject/Opponent.java</file>
             <file>file:/Users/work/NetBeansProjects/MpProject/src/mpproject/Team.java</file>
             <file>file:/Users/work/NetBeansProjects/MpProject/src/mpproject/MpProject.java</file>
+            <file>file:/Users/work/NetBeansProjects/MpProject/src/mpproject/MyObservable.java</file>
+            <file>file:/Users/work/NetBeansProjects/MpProject/src/mpproject/Match.java</file>
+            <file>file:/Users/work/NetBeansProjects/MpProject/src/mpproject/MyVisitor.java</file>
+            <file>file:/Users/work/NetBeansProjects/MpProject/src/mpproject/MyObserver.java</file>
         </group>
     </open-files>
 </project-private>

src/mpproject/Match.java

@@ -0,0 +1,17 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package mpproject;
+
+/**
+ *
+ * @author work
+ */
+public class Match {
+    private Opponent opponent1;
+    private Opponent opponent2;
+    private String score;
+    public static ObserverRegister<Match> observerRegister;
+}

src/mpproject/MyObservable.java

@@ -0,0 +1,16 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package mpproject;
+
+/**
+ *
+ * @author work
+ */
+public interface MyObservable <T>{
+    public void addObserver(MyObserver<T> o);
+    public void removeObserver(MyObserver<T> o);
+    public void notifyObservers(T event, String code);
+}

src/mpproject/MyObserver.java

@@ -0,0 +1,14 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package mpproject;
+
+/**
+ *
+ * @author work
+ */
+public interface MyObserver <T> {
+    public void update(T event, String code);
+}

src/mpproject/MyVisitor.java

@@ -0,0 +1,14 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package mpproject;
+
+/**
+ *
+ * @author work
+ */
+public interface MyVisitor <T> {
+    public void visit(T obj);
+}

src/mpproject/ObserverRegister.java

@@ -0,0 +1,38 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package mpproject;
+
+import java.util.LinkedList;
+
+
+/**
+ *
+ * @author work
+ */
+public class ObserverRegister <T> implements MyObservable<T>{
+    private LinkedList<MyObserver<T>> observers;
+
+    public ObserverRegister() {
+        this.observers = new LinkedList<>();
+    }
+
+
+    @Override
+    public void addObserver(MyObserver<T> o) {
+        observers.add(o);
+    }
+
+    @Override
+    public void removeObserver(MyObserver<T> o) {
+        observers.remove(o);
+    }
+
+    @Override
+    public void notifyObservers(T event, String code) {
+        observers.forEach(e -> e.update(event, code));
+    }   
+
+}