diff --git a/src/PictureBoxTracktorConfig.java b/src/PictureBoxTracktorConfig.java
index 24c5869..da650ee 100644
--- a/src/PictureBoxTracktorConfig.java
+++ b/src/PictureBoxTracktorConfig.java
@@ -22,34 +22,30 @@ public class PictureBoxTracktorConfig extends JPanel {
             return new StringSelection(((JLabel)c).getText());
         }
     }
-    private static class ColorTransferable implements Transferable {
-        private Color color;
-        private static final DataFlavor colorDataFlavor = new DataFlavor(Color.class, "Color");
 
-        public ColorTransferable(Color color) {
-            this.color = color;
-        }
+    private record ColorTransferable(Color color) implements Transferable {
+            private static final DataFlavor colorDataFlavor = new DataFlavor(Color.class, "Color");
 
         @Override
-        public DataFlavor[] getTransferDataFlavors() {
-            return new DataFlavor[]{colorDataFlavor};
-        }
+            public DataFlavor[] getTransferDataFlavors() {
+                return new DataFlavor[]{colorDataFlavor};
+            }
 
-        @Override
-        public boolean isDataFlavorSupported(DataFlavor flavor) {
-            return colorDataFlavor.equals(flavor);
-        }
+            @Override
+            public boolean isDataFlavorSupported(DataFlavor flavor) {
+                return colorDataFlavor.equals(flavor);
+            }
 
-        @Override
-        public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException {
-            if (isDataFlavorSupported(flavor)) {
-                return color;
-            } else {
-                throw new UnsupportedFlavorException(flavor);
+            @Override
+            public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException {
+                if (isDataFlavorSupported(flavor)) {
+                    return color;
+                } else {
+                    throw new UnsupportedFlavorException(flavor);
+                }
             }
         }
-    }
-    private class PanelTransferHandler extends TransferHandler {
+    private static class PanelTransferHandler extends TransferHandler {
         @Override
         public int getSourceActions(JComponent c) {
             return TransferHandler.COPY;
@@ -57,50 +53,45 @@ public class PictureBoxTracktorConfig extends JPanel {
 
         @Override
         protected Transferable createTransferable(JComponent c) {
-            return new ColorTransferable(((JPanel) c).getBackground());
+            return new ColorTransferable(c.getBackground());
         }
     }
-    private class LabelMouseAdapter extends MouseAdapter{
+    private static class LabelMouseAdapter extends MouseAdapter{
         @Override
         public void mousePressed(MouseEvent e) {
             ((JLabel)e.getComponent()).getTransferHandler().exportAsDrag(((JLabel)e.getComponent()), e, TransferHandler.COPY);
         }
     }
-    private class PanelMouseAdapter extends MouseAdapter{
+    private static class PanelMouseAdapter extends MouseAdapter{
         @Override
         public void mousePressed(MouseEvent e) {
             ((JPanel)e.getComponent()).getTransferHandler().exportAsDrag(((JPanel)e.getComponent()), e, TransferHandler.COPY);
         }
     }
 
-    private class RollersTransferable implements Transferable {
-        private IDrawningRollers rollersDrawning;
-        private static final DataFlavor rollersDrawningDataFlavor = new DataFlavor(IDrawningRollers.class, "Roller Drawing");
-
-        public RollersTransferable(IDrawningRollers rollersDrawning) {
-            this.rollersDrawning = rollersDrawning;
-        }
+    private record RollersTransferable(IDrawningRollers rollersDrawning) implements Transferable {
+            private static final DataFlavor rollersDrawningDataFlavor = new DataFlavor(IDrawningRollers.class, "Roller Drawing");
 
         @Override
-        public DataFlavor[] getTransferDataFlavors() {
-            return new DataFlavor[]{rollersDrawningDataFlavor};
-        }
+            public DataFlavor[] getTransferDataFlavors() {
+                return new DataFlavor[]{rollersDrawningDataFlavor};
+            }
 
-        @Override
-        public boolean isDataFlavorSupported(DataFlavor flavor) {
-            return flavor.equals(rollersDrawningDataFlavor);
-        }
+            @Override
+            public boolean isDataFlavorSupported(DataFlavor flavor) {
+                return flavor.equals(rollersDrawningDataFlavor);
+            }
 
-        @Override
-        public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException {
-            if (isDataFlavorSupported(flavor)) {
-                return rollersDrawning;
-            } else {
-                throw new UnsupportedFlavorException(flavor);
+            @Override
+            public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException {
+                if (isDataFlavorSupported(flavor)) {
+                    return rollersDrawning;
+                } else {
+                    throw new UnsupportedFlavorException(flavor);
+                }
             }
         }
-    }
-    private class RollerPanel extends JPanel{
+    private static class RollerPanel extends JPanel{
         public IDrawningRollers rollersDrawning;
 
         public RollerPanel(IDrawningRollers _rollersDrawning){
@@ -123,7 +114,7 @@ public class PictureBoxTracktorConfig extends JPanel {
 
                         @Override
                         protected Transferable createTransferable(JComponent c) {
-                            return new RollersTransferable(((RollerPanel)c).rollersDrawning);
+                            return new RollersTransferable(((RollerPanel) c).rollersDrawning);
                         }
                     }
             );
@@ -149,7 +140,7 @@ public class PictureBoxTracktorConfig extends JPanel {
             _tracktor.DrawTransport(g2d);
         }
     }
-    DrawningTracktor _tracktor = null;
+    DrawningTracktor _tracktor;
     JButton buttonAdd, buttonCancel;
     JLabel labelParameters, labelColors, labelSpeed, labelWeight, labelRollerAmount, labelSimpleObject, labelModifiedObject, labelBodyColor, labelBucketColor, labelSupportsColor, labelRollers, labelRollerPreview;
     JCheckBox checkBoxBucket, checkBoxSupports;
@@ -158,7 +149,7 @@ public class PictureBoxTracktorConfig extends JPanel {
     JPanel panelRed, panelGreen, panelBlue, panelYellow, panelWhite, panelGray, panelBlack, panelMagenta;
     TracktorPreview TracktorPreview;
     public PictureBoxTracktorConfig() {
-        Random random = new Random();
+        new Random();
         setLayout(null);
         setBounds(0, 0, 800, 300);
         buttonAdd = new JButton("Добавить");
@@ -424,13 +415,13 @@ public class PictureBoxTracktorConfig extends JPanel {
         labelRollers = new JLabel("Колеса");
         labelRollers.setBounds(250, 150, 100, 20);
         add(labelRollers);
-        RollerPanel RollerPanelDefault = new RollerPanel(new DrawningRollers((int)numericUpDownRollerAmount.getValue(),Color.RED));
+        RollerPanel RollerPanelDefault = new RollerPanel(new DrawningRollers((int) numericUpDownRollerAmount.getValue(), Color.RED));
         RollerPanelDefault.setBounds(250, 180, 40, 40);
         add(RollerPanelDefault);
-        RollerPanel RollerPanelCircles = new RollerPanel(new DrawningCrossRollers((int)numericUpDownRollerAmount.getValue(),Color.RED));
+        RollerPanel RollerPanelCircles = new RollerPanel(new DrawningCrossRollers((int) numericUpDownRollerAmount.getValue(), Color.RED));
         RollerPanelCircles.setBounds(300, 180, 40, 40);
         add(RollerPanelCircles);
-        RollerPanel RollerPanelStar = new RollerPanel(new DrawningSquaredRollers((int)numericUpDownRollerAmount.getValue(),Color.RED));
+        RollerPanel RollerPanelStar = new RollerPanel(new DrawningSquaredRollers((int) numericUpDownRollerAmount.getValue(), Color.RED));
         RollerPanelStar.setBounds(350, 180, 40, 40);
         add(RollerPanelStar);