refactoring: extract Methods for Interface

src/main/java/Gui/GameGui.java

@@ -11,7 +11,7 @@ import javax.swing.JLabel;
 import javax.swing.JPanel;
 
 
-public class GameGui {
+public class GameGui implements GameGuiInterface {
 
 public static JPanel MainPanel, ButtonPanel, headingPanel;
 public static JLabel Headline,QuestionLabel;
@@ -20,6 +20,7 @@ public static int questionNr = 0;
 GridLayout grid;
 GridBagConstraints gbc;
 
+	@Override
 	public void createGui() {
 		CreatePanel();
 		createHeadline();
@@ -28,6 +29,7 @@ GridBagConstraints gbc;
 		createButtons();
 	}
 
+	@Override
 	public void CreatePanel(){
 		MainPanel = new JPanel();
 		ButtonPanel = new JPanel();
@@ -37,6 +39,7 @@ GridBagConstraints gbc;
 		headingPanel.setLayout(grid);
 		gui.Frame.add(MainPanel);
 	}
+	@Override
 	public void createHeadline() {
 		Headline = new JLabel("Wer wird Millionär?");
 		headingPanel.add(Headline);
@@ -44,6 +47,7 @@ GridBagConstraints gbc;
 		Headline.setHorizontalAlignment(JLabel.CENTER);
 		Headline.setFont(new Font("Serif", Font.BOLD, 28));
 	}
+	@Override
 	public void createQuestionLabel() {
 		QuestionLabel = new JLabel("Questions");
 		MainPanel.add(QuestionLabel);
@@ -51,6 +55,7 @@ GridBagConstraints gbc;
 		QuestionLabel.setVerticalAlignment(JLabel.NORTH);
 		headingPanel.add(QuestionLabel);
 	}
+	@Override
 	public void createLayout() {
 		ButtonPanel.setLayout(new GridBagLayout());
 		gbc = new GridBagConstraints();
@@ -61,6 +66,7 @@ GridBagConstraints gbc;
 		gbc.ipady = 100;
 	}
 
+	@Override
 	public void createButtons() {		
 		AnswersBtn1 = new JButton();
 		gbc.gridx = 0;

src/main/java/Gui/GameGuiInterface.java

@@ -0,0 +1,17 @@
+package Gui;
+
+public interface GameGuiInterface {
+
+	void createGui();
+
+	void CreatePanel();
+
+	void createHeadline();
+
+	void createQuestionLabel();
+
+	void createLayout();
+
+	void createButtons();
+
+}

src/main/java/Gui/StartGameGui.java

@@ -14,7 +14,7 @@ public class StartGameGui implements ActionListener {
 		startGame();
 	}
 	public void startGame() {
-		GameGui Gui = new GameGui();
+		GameGuiInterface Gui = new GameGui();
 		Gui.createGui();
 		
 		runGame rungame = new runGame();