correction iterator (6.1)

src/main/java/_6/_1/HashMapMultiSet.java

@@ -1,41 +1,25 @@
 package _6._1;
 
-import java.util.HashMap;
-import java.util.Iterator;
+import java.util.*;
 
 public class HashMapMultiSet<T> implements MultiSet<T> {
-    private HashMap<T,Integer> map = new HashMap<>();
+    private Map<T,Integer> map = new HashMap<>();
 
+    @Override
     public Iterator<T> iterator() {
-        return new HashMapMultiSetIterator();
+        return map.keySet().iterator();
     }
 
+    @Override
     public void add(T element) {
-        if (map.containsKey(element)) {
-            map.put(element,map.get(element)+1);
-        } else {
-            map.put(element,1);
-        }
+            map.put(element,count(element)+1);
     }
 
+    @Override
     public int count(T element) {
         if (map.containsKey(element)) {
             return map.get(element);
         }
         return 0;
     }
-
-    class HashMapMultiSetIterator implements Iterator<T> {
-        @Override
-        public boolean hasNext() {
-            return map.keySet().iterator().hasNext();
-        }
-
-        @Override
-        public T next() {
-            return map.keySet().iterator().next();
-        }
-
-    }
-
 }