added some comments

src/main/java/de/anxietyprime/swajodel/JodelPost.java

@@ -5,38 +5,55 @@ import java.util.Optional;
 import java.util.Vector;
 
 public class JodelPost {
+    // id of the post
     private Long id;
+    // id of the author in db
     private Long authorID;
 
+    // anonymized authorID
     public Long anonymousID;
+    // title of the post
     public String title;
+    // content of the post
     public String content;
+    // date of the post
     public Date date;
+    // location if the post
     public Location location;
+    // list of all comments for the post
     public Vector<JodelPost> comments = new Vector<>();
+    // the own reaction (null = none, true = positive, false = negative)
     public Optional<Boolean> reaction;
-    public Reaction[] reactions;
+    // all other reactions
+    public Reaction reactions;
 
+    // anonymize function to recursively anonymize the posts
     public void anonymize(Optional<Vector<Long>> idCache) {
+        // check if this is the first post in this process
         if (idCache.isEmpty()) {
+            // create a new Vector as cache
             idCache = Optional.of(new Vector());
         }
-        System.out.println(idCache);
 
+        // get the anonymized id as index in cached authorIDs
         int i = idCache.get().indexOf(this.authorID);
+        // if the index is -1 the authorID has not been cached jet
         if (i == -1) {
+            // set the current anonymousID as length of the cache (== next index)
             this.anonymousID = (long) idCache.get().size();
+            // push the current authorID to to cache
             idCache.get().add(this.authorID);
         }
-        else {
-            this.anonymousID = (long) i;
-        }
+        // the authorID has been anonymized once before, so we can get it from cache
+        else this.anonymousID = (long) i;
 
+        // recursively apply this algorithm for all comments, but include the idCache
         for (JodelPost comment : this.comments) {
             comment.anonymize(idCache);
         }
     }
 
+    // TODO: create constructor
     public JodelPost(long id) {
         this.authorID = id;
     }

src/main/java/de/anxietyprime/swajodel/Routes.java

@@ -11,10 +11,12 @@ public class Routes {
 
     @GetMapping("")
     public JodelPost test() {
+        // TODO: remove dec post
         JodelPost post = new JodelPost(100);
 
+        // calculate anonymous IDs for the post
         post.anonymize(Optional.empty());
-
+        // return the post
         return post;
     }