qqq

src/main/java/ru/egspt/App.java

@@ -29,6 +29,8 @@ public class App extends JPanel{
         mainframe.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
         mainframe.add(this);
         mainframe.setSize(640, 480);
+        //mainframe.setLocationByPlatform(true);
+        //mainframe.pack();
         mainframe.setVisible(true);
     }
     /**