added constants to Asset

Projekte/mdga/client/src/main/java/pp/mdga/client/Asset.java

@@ -28,10 +28,13 @@ public enum Asset {
     private final String diffPath;
     private final float size;
 
+    private static final String MODEL_FILETYPE = ".j3o";
+    private static final String DIFFUSE_EXT = "_diff.png";
+
     Asset(){
         String folderFileName = "./" + name() + "/" + name();
-        this.modelPath = folderFileName + ".j3o";
-        this.diffPath = folderFileName + "_diff.png";
+        this.modelPath = folderFileName + MODEL_FILETYPE;
+        this.diffPath = folderFileName + DIFFUSE_EXT;
         this.size = 1f;
     }
 
@@ -43,8 +46,8 @@ public enum Asset {
 
     Asset(float size){
         String folderFileName = "./" + name() + "/" + name();
-        this.modelPath = folderFileName + ".j3o";
-        this.diffPath = folderFileName + "_diff.png";
+        this.modelPath = folderFileName + MODEL_FILETYPE;
+        this.diffPath = folderFileName + DIFFUSE_EXT;
         this.size = size;
     }