Fixes

FormMapWithSetArtilleries.java

@@ -157,12 +157,14 @@ public class FormMapWithSetArtilleries extends JFrame {
         buttonShowDeleted.addActionListener(e -> {
             if (!deletedObjects.empty()) {
                 DrawingObjectArtillery deleted = (DrawingObjectArtillery) deletedObjects.pop();
-                FormArtillery dialog = new FormArtillery(deleted == null ? null : deleted.getArtillery());
+                FormArtillery dialog = new FormArtillery(deleted.getArtillery());
                 dialog.setSize(800, 500);
                 dialog.setModalityType(Dialog.ModalityType.APPLICATION_MODAL);
                 dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
 
                 dialog.setVisible(true);
+            } else {
+                JOptionPane.showMessageDialog(this, "Стек удалённых объектов пуст", "Провал", JOptionPane.INFORMATION_MESSAGE);
             }
         });
 

MapWithSetArtilleriesGeneric.java

@@ -7,7 +7,7 @@ public class MapWithSetArtilleriesGeneric<T extends IDrawingObject, U extends Ab
     public final int _pictureHeight;
     public final int _placeSizeWidth = 210;
     public final int _placeSizeHeight = 90;
-    private final SetArtilleriesGeneric<T> _setArtilleries;
+    public final SetArtilleriesGeneric<T> _setArtilleries;
     private final U _map;
 
     public MapWithSetArtilleriesGeneric(int picWidth, int picHeight, U map) {

MapsCollection.java

@@ -30,4 +30,12 @@ public class MapsCollection {
     public MapWithSetArtilleriesGeneric<IDrawingObject, AbstractMap> getMap(String name) {
         return _mapsStorage.getOrDefault(name, null);
     }
+
+    public IDrawingObject getArtillery(String mapName, int index) {
+        var map = _mapsStorage.getOrDefault(mapName, null);
+        if (map != null) {
+            return map._setArtilleries.get(index);
+        }
+        return null;
+    }
 }