solution

.gitignore

@@ -2,3 +2,4 @@
 .settings/
 .project
 .classpath
+/score.csv

src/main/java/lab/GameController.java

 	package lab;
 
+import static java.util.Comparator.comparingInt;
+
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Random;
+import java.util.Scanner;
+import java.util.Set;
+
 import javafx.animation.AnimationTimer;
 import javafx.beans.value.ObservableValue;
+import javafx.collections.FXCollections;
 import javafx.fxml.FXML;
 import javafx.scene.canvas.Canvas;
 import javafx.scene.control.Label;
+import javafx.scene.control.ListView;
 import javafx.scene.control.Slider;
+import javafx.scene.control.TextField;
 
 public class GameController {
 
@@ -26,12 +43,26 @@ public class GameController {
 	@FXML
 	private Label hits;
 	
+	@FXML
+	private TextField nameField;
+	
+	@FXML
+	private ListView<Score> scoreList;
+	
+	private List<Score> highScore;
+	
 	private AnimationTimer animationTimer;
+
+	private final Random rnd;
 	
 	public GameController() {
+		rnd = new Random();
 	}
 	
 	public void startGame() {
+		scoreList.setItems(FXCollections.observableList(new ArrayList<>()));
+		highScore = scoreList.getItems();
+		
 		this.world = new World(canvas.getWidth(), canvas.getHeight());
 		this.world.setGameListener(new GameListenerImpl());
 		//Draw scene on a separate thread to avoid blocking UI.
@@ -55,6 +86,74 @@ public class GameController {
 		world.fire();
 	}
 	
+	@FXML
+	private void gameOver( ) {
+		int score = rnd.nextInt(11);
+		String name = nameField.getText();
+		highScore.add(new Score(score, name));
+		Collections.sort(highScore, comparingInt(Score::getScore).reversed());
+		/*
+			Collections.sort(highScore, new Comparator<Score>() {
+
+			@Override
+			public int compare(Score o1, Score o2) {
+				return Integer.compare(o1.getScore(), o2.getScore());
+			}}.reversed());
+			
+			Collections.sort(highScore, ((Comparator<Score>)(o1,o2)->Integer.compare(o1.getScore(), o2.getScore())).reversed() );
+			
+			Collections.sort(highScore, (o1,o2)->Integer.compare(o2.getScore(), o1.getScore()) );
+			*/
+		
+		
+	}
+	
+	
+	@FXML
+	private void highScore( ) {
+		Set<Score> tempSet = new LinkedHashSet<>();
+		tempSet.addAll(highScore);
+		highScore.clear();
+		highScore.addAll(tempSet);
+	}
+	
+	@FXML
+	private void save() {
+		try(PrintWriter pw = new PrintWriter(new FileWriter("score.csv"))) {
+			
+			for (Score score: highScore) {
+				pw.printf("%s;%d\n", score.getName(), score.getScore());
+			}
+			/*
+			Iterator<Score> iterator = highScore.iterator();
+			while(iterator.hasNext()) {
+				Score score = iterator.next();
+				pw.printf("%s;%d\n", score.getName(), score.getScore());
+				//iterator.remove();
+			}
+			*/
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+	}
+	
+	@FXML
+	private void load() {
+		highScore.clear();
+		try(Scanner scanner = new Scanner(new File("score.csv")).useDelimiter("[;\\n]");){
+				//String []token = line.split(";");
+			while(scanner.hasNext()) {
+				String name = scanner.next();
+				int score = scanner.nextInt();
+				
+				highScore.add(new Score(score, name));
+			}
+		
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+	}
+	
 	
 	private void angleChanged(ObservableValue<? extends Number> observable
 								, Number oldValue, Number newValue) {

src/main/java/lab/Score.java

+package lab;
+
+public class Score {
+	
+	private final int score;
+	private final String name;
+	public Score(int score, String name) {
+		this.score = score;
+		this.name = name;
+	}
+	
+	public int getScore() {
+		return score;
+	}
+	
+	public String getName() {
+		return name;
+	}
+	
+	
+	@Override
+	public String toString() {
+		return name + ": " + score;
+	}
+	
+	
+	@Override
+	public boolean equals(Object obj) {
+		if (obj instanceof Score score) {
+			return this.name.equals(score.getName());
+		}
+		return false;
+	}
+	
+	@Override
+	public int hashCode() {
+		return name.hashCode();
+	}
+}

src/main/resources/lab/GameView.fxml

@@ -5,14 +5,17 @@
 <?import javafx.scene.canvas.Canvas?>
 <?import javafx.scene.control.Button?>
 <?import javafx.scene.control.Label?>
+<?import javafx.scene.control.ListView?>
 <?import javafx.scene.control.Slider?>
+<?import javafx.scene.control.TextField?>
 <?import javafx.scene.layout.BorderPane?>
 <?import javafx.scene.layout.ColumnConstraints?>
 <?import javafx.scene.layout.GridPane?>
 <?import javafx.scene.layout.HBox?>
 <?import javafx.scene.layout.RowConstraints?>
+<?import javafx.scene.layout.VBox?>
 
-<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" xmlns="http://javafx.com/javafx/17" xmlns:fx="http://javafx.com/fxml/1" fx:controller="lab.GameController">
+<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" xmlns="http://javafx.com/javafx/18" xmlns:fx="http://javafx.com/fxml/1" fx:controller="lab.GameController">
    <bottom>
       <HBox alignment="CENTER" BorderPane.alignment="CENTER_LEFT">
          <children>
@@ -41,11 +44,25 @@
                   <Label text="Shoots:" />
                   <Label fx:id="shoots" text="0" GridPane.columnIndex="1" />
                   <Label text="Hits:" GridPane.rowIndex="1" />
-                  <Label fx:id="hits" text="0" GridPane.rowIndex="1" GridPane.columnIndex="1" />
+                  <Label fx:id="hits" text="0" GridPane.columnIndex="1" GridPane.rowIndex="1" />
                </children>
             </GridPane>
             <Canvas fx:id="canvas" height="400.0" width="600.0" />
          </children>
       </Group>
    </center>
+   <left>
+      <VBox BorderPane.alignment="CENTER">
+         <children>
+            <TextField fx:id="nameField" prefWidth="140.0" />
+            <Button mnemonicParsing="false" onAction="#gameOver" prefWidth="140.0" text="Game Over" VBox.vgrow="ALWAYS" />
+            <Button mnemonicParsing="false" onAction="#highScore" prefWidth="140.0" text="High Scores" />
+            <Button mnemonicParsing="false" onAction="#save" prefWidth="140.0" text="Save" />
+            <Button mnemonicParsing="false" onAction="#load" prefWidth="140.0" text="Load" />
+         </children>
+      </VBox>
+   </left>
+   <right>
+      <ListView fx:id="scoreList" prefHeight="200.0" prefWidth="200.0" BorderPane.alignment="CENTER" />
+   </right>
 </BorderPane>