added gui controll or back button

src/main/java/src/MainFrame.java

@@ -18,6 +18,7 @@ import java.util.LinkedList;
 public class MainFrame extends JFrame {
 
     LinkedList<Model> history;
+    int historyPosition;
 
     private GameField gameField;
 
@@ -30,6 +31,7 @@ public class MainFrame extends JFrame {
 
         history = new LinkedList<>();
 
+
         this.setLayout(null);
         this.setVisible(true);
         this.setBounds(300, 200, 500, 600);
@@ -52,6 +54,8 @@ public class MainFrame extends JFrame {
         gameField.setBounds(70, 50, 360, 360);
         rootPanel.add(gameField);
 
+        history.add(new Model(gameField));
+
         int j = 0;
 
         JPanel boxPanel = setupJPanel();
@@ -118,17 +122,28 @@ public class MainFrame extends JFrame {
             }
         });
 
-        JButton newButton  = new JButton();
-        newButton.setVisible(true);
-        newButton.setBounds(395, 5, 100, 25);
-        newButton.setText("Vorwärts");
-        rootPanel.add(newButton);
+//        JButton newButton  = new JButton();
+//        newButton.setVisible(true);
+//        newButton.setBounds(395, 5, 100, 25);
+//        newButton.setText("Vorwärts");
+//        rootPanel.add(newButton);
 
         JButton backButton  = new JButton();
         backButton.setVisible(true);
         backButton.setBounds(10, 5, 100, 25);
         backButton.setText("Rückwärts");
         rootPanel.add(backButton);
+        backButton.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                int size = history.size();
+                if (size > 1) {
+                    Model model = history.get(size - 2);
+                    history.removeLast();
+                    model.modelToGameField();
+                }
+            }
+        });
 
         JButton retryButton = new JButton();
         retryButton.setVisible(true);
@@ -183,8 +198,6 @@ public class MainFrame extends JFrame {
         numLabel1.setVisible(true);
         jPanel.add(numLabel1);
 
-
-
         return jPanel;
     }
 
@@ -264,6 +277,7 @@ public class MainFrame extends JFrame {
                 loadDataToGameField((JSONObject) currentGameDifficulty.get(0));
                 currentPosition = 0;
                 currentGameLabel.setText((currentPosition+1)+"/"+currentGameDifficulty.size());
+                history.add(new Model(gameField));
             }
         });
 
@@ -282,6 +296,7 @@ public class MainFrame extends JFrame {
                 loadDataToGameField((JSONObject) currentGameDifficulty.get(0));
                 currentPosition = 0;
                 currentGameLabel.setText((currentPosition+1)+"/"+currentGameDifficulty.size());
+                history.add(new Model(gameField));
             }
         });
 
@@ -300,6 +315,7 @@ public class MainFrame extends JFrame {
                 loadDataToGameField((JSONObject) currentGameDifficulty.get(0));
                 currentPosition = 0;
                 currentGameLabel.setText((currentPosition+1)+"/"+currentGameDifficulty.size());
+                history.add(new Model(gameField));
             }
         });