Added 'HiddenCard', 'ShieldCard', 'SwapCard' and 'TurboCard' classes.

Updated the 'HiddenCard', 'ShieldCard', 'SwapCard' and 'TurboCard' classes to this project. They will be used to display different types of power cards.

Projekte/mdga/model/src/main/java/pp/mdga/game/card/HiddenCard.java

@@ -0,0 +1,27 @@
+package pp.mdga.game.card;
+
+import pp.mdga.game.BonusCard;
+import pp.mdga.visitor.Visitor;
+
+/**
+ * This class represents the hidden power card of this application.
+ */
+public class HiddenCard extends PowerCard {
+    /**
+     * Constructor.
+     */
+    public HiddenCard() {
+        this.card = BonusCard.HIDDEN;
+    }
+
+    /**
+     * This method will be used to call the visit method of the given visitor parameter and pass a PowerCard object.
+     *
+     * @param visitor as the visitor which will differentiates between all types of power card types as a Visitor
+     *                interface.
+     */
+    @Override
+    public void accept(Visitor visitor) {
+        visitor.visit(this);
+    }
+}

Projekte/mdga/model/src/main/java/pp/mdga/game/card/ShieldCard.java

@@ -0,0 +1,26 @@
+package pp.mdga.game.card;
+
+import pp.mdga.game.BonusCard;
+import pp.mdga.visitor.Visitor;
+
+/**
+ * This class represents the shield power card of this application.
+ */
+public class ShieldCard extends PowerCard {
+    /**
+     * Constructor.
+     */
+    public ShieldCard() {
+        this.card = BonusCard.SHIELD;
+    }
+    /**
+     * This method will be used to call the visit method of the given visitor parameter and pass a PowerCard object.
+     *
+     * @param visitor as the visitor which will differentiates between all types of power card types as a Visitor
+     *                interface.
+     */
+    @Override
+    public void accept(Visitor visitor) {
+        visitor.visit(this);
+    }
+}

Projekte/mdga/model/src/main/java/pp/mdga/game/card/SwapCard.java

@@ -0,0 +1,27 @@
+package pp.mdga.game.card;
+
+import pp.mdga.game.BonusCard;
+import pp.mdga.visitor.Visitor;
+
+/**
+ * This class represents the swap power card of this application.
+ */
+public class SwapCard extends PowerCard {
+    /**
+     * Constructor.
+     */
+    public SwapCard() {
+        this.card = BonusCard.SWAP;
+    }
+
+    /**
+     * This method will be used to call the visit method of the given visitor parameter and pass a PowerCard object.
+     *
+     * @param visitor as the visitor which will differentiates between all types of power card types as a Visitor
+     *                interface.
+     */
+    @Override
+    public void accept(Visitor visitor) {
+        visitor.visit(this);
+    }
+}

Projekte/mdga/model/src/main/java/pp/mdga/game/card/TurboCard.java

@@ -0,0 +1,27 @@
+package pp.mdga.game.card;
+
+import pp.mdga.game.BonusCard;
+import pp.mdga.visitor.Visitor;
+
+/**
+ * This class represents the turbo power card of this application.
+ */
+public class TurboCard extends PowerCard {
+    /**
+     * Constructor.
+     */
+    public TurboCard() {
+        this.card = BonusCard.TURBO;
+    }
+
+    /**
+     * This method will be used to call the visit method of the given visitor parameter and pass a PowerCard object.
+     *
+     * @param visitor as the visitor which will differentiates between all types of power card types as a Visitor
+     *                interface.
+     */
+    @Override
+    public void accept(Visitor visitor) {
+        visitor.visit(this);
+    }
+}