Add CreditsScreen Template.

src/de/teamteamteam/spacescooter/datastructure/ConcurrentLinkedList.java

@@ -47,7 +47,7 @@ public class ConcurrentLinkedList<T> {
 		while(element.equals(currentNode.getValue()) == false && currentNode.hasNext()) {
 			currentNode = currentNode.next();
 		}
-		if(currentNode.getValue().equals(element)) {
+		if(currentNode.getValue() != null && currentNode.getValue().equals(element)) {
 			currentNode.setValue(null);
 			return;
 		}

src/de/teamteamteam/spacescooter/screen/CreditsScreen.java

@@ -0,0 +1,47 @@
+package de.teamteamteam.spacescooter.screen;
+
+import java.awt.Color;
+import java.awt.Font;
+import java.awt.Graphics2D;
+import java.awt.event.KeyEvent;
+
+import de.teamteamteam.spacescooter.brain.GameConfig;
+import de.teamteamteam.spacescooter.control.Keyboard;
+import de.teamteamteam.spacescooter.entity.enemy.EnemyOne;
+
+/**
+ * This is the Screen where you can look at all those awesome guys who created this game. :D
+ */
+public class CreditsScreen extends Screen {
+	
+	/**
+	 * Default Constructor
+	 */
+	public CreditsScreen(Screen parent) {
+		super(parent);
+	}
+	
+	/**
+	 * Draw the Credits :)
+	 */
+	@Override
+	protected void paint(Graphics2D g) {
+		g.setColor(new Color(0,0,120));
+		g.fillRect(0, 0, GameConfig.windowWidth, GameConfig.windowHeight);
+		g.setColor(Color.WHITE);
+		g.setFont(new Font("Monospace", 0, 50));
+		String text = "#yolo";
+		g.drawString(text, (GameConfig.windowWidth - g.getFontMetrics().stringWidth(text))/2, 150);
+	}
+
+	/**
+	 * In case the Loader is done, immediately fire up the MainMenuScreen.
+	 */
+	@Override
+	protected void update() {
+		if(Keyboard.isKeyDown(KeyEvent.VK_ENTER) || Keyboard.isKeyDown(KeyEvent.VK_SPACE)) {
+			this.parent.setOverlay(new MainMenuScreen(this.parent));
+		}
+ 	}
+
+}

src/de/teamteamteam/spacescooter/screen/MainMenuScreen.java

@@ -108,6 +108,7 @@ public class MainMenuScreen extends Screen {
 					this.parent.setOverlay(new HighscoreScreen(this.parent));
 					break;
 				case 3:
+					this.parent.setOverlay(new CreditsScreen(this.parent));
 					break;
 				case 4:
 					System.exit(0);

src/de/teamteamteam/spacescooter/screen/Screen.java

@@ -241,6 +241,8 @@ public abstract class Screen {
 		if(this.processSetOverlayCall) {
 			if(this.overlay != null) {
 				this.overlay.cleanup();
+			} else {
+				this.cleanup();
 			}
 			if(this.newOverlay == null) {
 				Screen.currentScreen = this;