Simplified some calculations

src/main/dev/lh/FoodFactory.java

@@ -1,6 +1,7 @@
 package dev.lh;
 
 import java.awt.*;
+import java.util.Random;
 
 import dev.lh.ui.GameWindow;
 
@@ -56,7 +57,7 @@ public class FoodFactory {
 
 	private long timeOfNextFood;
 
-	Point pFood = null;
+	private Point pFood;
 
 	private Food nextFood = Food.white;
 
@@ -75,27 +76,8 @@ public class FoodFactory {
 	 * @since Snake 1.0
 	 */
 	public Food generateFood() {
-		int nextFoodIs = (int) Math.floor(Math.random() * 5);
-		switch (nextFoodIs) {
-
-			case 0:
-				nextFood = Food.white;
-				break;
-			case 1:
-				nextFood = Food.yellow;
-				break;
-			case 2:
-				nextFood = Food.orange;
-				break;
-			case 3:
-				nextFood = Food.red;
-				break;
-			case 4:
-				nextFood = Food.blue;
-				break;
-			default:
-				nextFood = generateFood();
-		}
+		int n = new Random().nextInt(Food.values().length + 1);
+		nextFood = n == Food.values().length ? generateFood() : Food.values()[n];
 		rectangleSize = nextFood.ordinal() + 2;
 		setTimeToNextFoodMillis();
 		return nextFood;
@@ -107,7 +89,9 @@ public class FoodFactory {
 	 *
 	 * @since Snake 1.0
 	 */
-	public void setTimeToNextFoodMillis() { timeOfNextFood = System.currentTimeMillis() + (int) Math.round(Math.random() * 15000 + 1000); }
+	public void setTimeToNextFoodMillis() {
+		timeOfNextFood = System.currentTimeMillis() + new Random().nextInt(15000) + 1000;
+	}
 
 	/**
 	 * @return the type of the next food
@@ -134,11 +118,9 @@ public class FoodFactory {
 	 * @since Snake 1.0
 	 */
 	public Point generateFoodLocation(int width, int height) {
-		pFood = new Point((int) Math.round(Math.random() * width), (int) Math.round(Math.random() * height));
-		if (pFood.x < 50 || pFood.x > width - 50 || pFood.y < 50 || pFood.y > height - 50) {
-			pFood.x	= (pFood.x < 50) ? 50 : (pFood.x > width - 50) ? width - 50 : pFood.x;
-			pFood.y	= (pFood.y < 50) ? 50 : (pFood.y > height - 50) ? height - 50 : pFood.y;
-		}
+		assert (width > 100 && height > 100);
+		Random r = new Random();
+		pFood = new Point(r.nextInt(width - 100) + 50, r.nextInt(height - 100) + 50);
 		return pFood;
 	}
 
@@ -178,7 +160,7 @@ public class FoodFactory {
 			case blue:
 				g.setColor(Color.blue);
 				break;
-		}// switch
+		}
 	}
 
 	/**

src/main/dev/lh/Snake.java

@@ -1,9 +1,6 @@
 package dev.lh;
 
-import java.awt.Color;
-import java.awt.Graphics;
-import java.awt.Point;
-import java.awt.Rectangle;
+import java.awt.*;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -54,7 +51,7 @@ public class Snake implements Updateable {
 
 	private static FoodFactory	foodFactory	= FoodFactory.getInstance();
 	private static Endscreen	endscreen;
-	private Direction			Richtung;
+	private Direction			direction;
 	private int					length;
 	private List<Point>			tiles		= new ArrayList<>();
 	private final int			snakeSize	= 10;
@@ -67,7 +64,7 @@ public class Snake implements Updateable {
 	 */
 	public Snake(int length) {
 		this.length	= length;
-		Richtung	= Direction.Right;
+		direction	= Direction.Right;
 		// adding the initial tiles of the snake
 		for (int i = 0; i < length; i++)
 			tiles.add(new Point(320 - snakeSize * i, 240));
@@ -114,12 +111,12 @@ public class Snake implements Updateable {
 	 * @return the current {@link Direction} of the snake
 	 * @since Snake 1.0
 	 */
-	public Direction getRichtung() { return Richtung; }
+	public Direction getRichtung() { return direction; }
 
 	@Override
 	public void nextFrame() {
 		int velX = 0, velY = 0;
-		switch (Richtung) {
+		switch (direction) {
 			case Up:
 				velY = -snakeSize;
 				break;
@@ -173,8 +170,8 @@ public class Snake implements Updateable {
 	}
 
 	/**
-	 * @param richtung the new {@link Direction} of the snake
+	 * @param direction the new {@link Direction} of the snake
 	 * @since Snake 1.0
 	 */
-	public void setRichtung(Direction richtung) { Richtung = richtung; }
+	public void setDirection(Direction direction) { this.direction = direction; }
 }

src/main/dev/lh/ui/Endscreen.java

@@ -54,7 +54,6 @@ public class Endscreen extends JDialog {
 			Image resultImage = Toolkit.getDefaultToolkit()
 				.getImage(this.getClass().getResource((score < goodOrBadResult) ? "/Try_Again.jpg" : "/1211548-200.png"));
 			resultImage.flush();
-
 		} catch (Exception e) {
 			e.printStackTrace();
 		}

src/main/dev/lh/ui/GameWindow.java

@@ -33,7 +33,6 @@ public class GameWindow extends JFrame {
 	 */
 	public GameWindow(String title) {
 		super(title);
-		newFood();
 		Dimension size = Toolkit.getDefaultToolkit().getScreenSize();
 		setBounds(new Rectangle(size));
 		setLocation(0, 0);
@@ -67,41 +66,47 @@ public class GameWindow extends JFrame {
 				switch (e.getKeyCode()) {
 					case KeyEvent.VK_W:
 					case KeyEvent.VK_UP:
-						if (!s.getRichtung().equals(Direction.Down)) s.setRichtung(Direction.Up);
+						if (!s.getRichtung().equals(Direction.Down)) s.setDirection(Direction.Up);
 						break;
 					case KeyEvent.VK_A:
 					case KeyEvent.VK_LEFT:
-						if (!s.getRichtung().equals(Direction.Right)) s.setRichtung(Direction.Left);
+						if (!s.getRichtung().equals(Direction.Right)) s.setDirection(Direction.Left);
 						break;
 					case KeyEvent.VK_S:
 					case KeyEvent.VK_DOWN:
-						if (!s.getRichtung().equals(Direction.Up)) s.setRichtung(Direction.Down);
+						if (!s.getRichtung().equals(Direction.Up)) s.setDirection(Direction.Down);
 						break;
 					case KeyEvent.VK_D:
 					case KeyEvent.VK_RIGHT:
-						if (!s.getRichtung().equals(Direction.Left)) s.setRichtung(Direction.Right);
+						if (!s.getRichtung().equals(Direction.Left)) s.setDirection(Direction.Right);
 						break;
 				}
 			}
 		});
 
+		newFood();
 		timer = new Timer(
 			50,
-				evt -> { s.nextFrame(); if (System.currentTimeMillis() >= foodFactory.getTimeOfNextFood()) newFood(); repaint(); });
+			evt -> {
+				s.nextFrame();
+					if (System.currentTimeMillis() >= foodFactory.getTimeOfNextFood())
+					newFood();
+				repaint();
+			}
+		);
 		timer.start();
 
 		setVisible(true);
 	}
 
 	/**
-	 * Generates new food
+	 * Generates new food.
 	 *
 	 * @since Snake 1.1
 	 */
 	public void newFood() {
 		foodFactory.generateFood();
 		foodFactory.generateFoodLocation(getWidth(), getHeight());
-		repaint();
 	}
 
 	/**

src/main/dev/lh/ui/StartScreen.java

@@ -25,7 +25,7 @@ public class StartScreen extends JFrame {
 	private JPanel				contentPane;
 
 	/**
-	 * closes the application.
+	 * Closes the application.
 	 */
 	public static void close() { System.exit(0); }
 
@@ -36,14 +36,7 @@ public class StartScreen extends JFrame {
 	 * @since Snake 1.0
 	 */
 	public static void main(String[] args) {
-		EventQueue.invokeLater(() -> {
-			try {
-				StartScreen frame = new StartScreen();
-				frame.setVisible(true);
-			} catch (Exception e) {
-				e.printStackTrace();
-			}
-		});
+		EventQueue.invokeLater(StartScreen::new);
 	}
 
 	/**
@@ -65,7 +58,6 @@ public class StartScreen extends JFrame {
 			buPlay.setMnemonic(KeyEvent.VK_ENTER);
 			buPlay.setFont(new Font("Times New Roman", Font.PLAIN, 16));
 			buPlay.addActionListener(a -> {
-
 				Main.startGame();
 				setVisible(false);
 				dispose();
@@ -73,9 +65,8 @@ public class StartScreen extends JFrame {
 			});
 			contentPane.add(buPlay);
 			contentPane.setLayout(null);
-
+			setVisible(true);
 		} catch (Exception e) {
-
 			e.printStackTrace();
 		}
 	}