add dialogue setup and improve item handling in inventory

src/de/miaurizius/jgame2d/entity/Player.java

@@ -12,6 +12,7 @@ import de.miaurizius.jgame2d.entity.projectile.FireballObj;
 
 import java.awt.*;
 import java.awt.image.BufferedImage;
+import java.lang.reflect.InvocationTargetException;
 
 public class Player extends Entity {
 
@@ -281,6 +282,7 @@ public class Player extends Entity {
         attack = getAttack();
         defense = getDefense();
         panel.playSE(8);
+        setDialogue();
         startDialogue(this,0);
     }
     public void selectItem() {
@@ -433,18 +435,22 @@ public class Player extends Entity {
     }
     public boolean canObtainItem(Entity item) {
         int i = searchItemInInventory(item.name);
+        try {
             if(item.stackable) {
                 if(i != 999) {
                     inventory.get(i).amt++;
                     return true;
                 } else if(inventory.size() != maxInvSize) {
-                inventory.add(item);
+                    inventory.add((Entity) Class.forName(item.getClass().getName()).getDeclaredConstructor(GamePanel.class).newInstance(panel));
                     return true;
                 }
             } else if(inventory.size() != maxInvSize) {
-            inventory.add(item);
+                inventory.add((Entity) Class.forName(item.getClass().getName()).getDeclaredConstructor(GamePanel.class).newInstance(panel));
                 return true;
             }
+        } catch(ClassNotFoundException | NoSuchMethodException | InstantiationException | IllegalAccessException | InvocationTargetException e) {
+            throw new RuntimeException(e);
+        }
         return false;
     }
     @Override