Added 27 solutions

Java/Data Structures/Java Comparator/Solution.java

@@ -10,7 +10,7 @@ class Checker implements Comparator<Player> {
         if (p1.score == p2.score) {
             return p1.name.compareTo(p2.name);
         } else {
-            return p2.score - p1.score;
+            return p2.score - p1.score; // descending order
         }
     }
 }