done дон done

src/CarCollectionFrame.java

@@ -60,7 +60,7 @@ public class CarCollectionFrame extends JFrame {
                     CarsGenericCollection<DrawingCar, DrawingObjectCar> _cars = _storage.Get(listBoxStoragesJList.getSelectedValue());
                     GameFrame form = new GameFrame();
                     if (form.getSelectedCar() != null) {
-                        if (_cars.plus(_cars, form.SelectedCar) != -1) {
+                        if (_cars.plus(_cars, form.SelectedCar)) {
                             JOptionPane.showMessageDialog(null, "Объект добавлен");
 
                         } else {

src/Generics/CarsGenericCollection.java

@@ -23,11 +23,11 @@ public class CarsGenericCollection<T extends DrawingCar, U extends IMoveableObje
         _pictureHeight = picHeight;
         _collection = new SetGeneric<T>(width * height);
     }
-    public int plus(CarsGenericCollection<T, U> collect, T obj)
+    public boolean plus(CarsGenericCollection<T, U> collect, T obj)
     {
         if (obj == null)
         {
-            return -1;
+            return false;
         }
         return collect._collection.Insert(obj);
     }

src/Generics/SetGeneric.java

@@ -1,56 +1,52 @@
 package Generics;
 
+import java.util.ArrayList;
+import java.util.List;
+
 public class SetGeneric<T extends Object> {
-    private Object[] _places;
+    private final List<T> _places;
+    private final int _maxCount;
+    public int Count;
 
     public int Count() {
-        return _places.length;
+        return Count;
     }
 
     public SetGeneric(int count)
     {
-        _places = new Object[count];
+        _places = new ArrayList<>();
+        _maxCount = count;
     }
 
-    public int Insert(T car)
-    {
-        return Insert(car,0);
+    public boolean Insert(T car){
+        if(_places.size() == _maxCount)
+            return false;
+        Insert(car, 0);
+        return true;
     }
 
-    public int Insert(T car, int position)
-    {
-        if (!(position >= 0 && position < Count()))
-            return -1;
-        if (_places[position] != null)
-        {
-            int indexEnd = position + 1;
-            while (_places[indexEnd] != null)
-            {
-                indexEnd++;
-            }
-            for (int i = indexEnd + 1; i > position; i--)
-            {
-                _places[i] = _places[i - 1];
-            }
-
-        }
-        _places[position] = car;
-        return position;
+    public boolean Insert(T monorail, int position){
+        if (!(position >= 0 && position <= _places.size() && _places.size() < _maxCount))
+            return false;
+        _places.add(position, monorail);
+        Count++;
+        return true;
     }
 
     public boolean Remove(int position)
     {
-        if (position < Count() && position >= 0)
+        if(!(position >= 0 && position < _places.size()))
         {
-            _places[position] = null;
-            return true;
+            return false;
         }
-        return false;
+        _places.remove(position);
+        Count--;
+        return true;
     }
 
     public T Get(int position)
     {
-        if (position < Count() && position >= 0) { return (T)_places[position]; }
+        if (position < Count() && position >= 0) {  return (T)_places.get(position); }
         return null;
     }
 }