refactor 451

Author: fishercoder1534

src/main/java/com/fishercoder/solutions/_451.java

@@ -3,6 +3,8 @@
 import java.util.*;
 
 /**
+ * 451. Sort Characters By Frequency
+ *
  * Given a string, sort it in decreasing order based on the frequency of characters.
 
  Example 1:
@@ -46,9 +48,11 @@ public class _451 {
 
     public String frequencySort(String s) {
         Map<Character, Integer> map = new HashMap();
-        for (char c : s.toCharArray()) map.put(c, map.getOrDefault(c, 0) + 1);
+        for (char c : s.toCharArray()) {
+            map.put(c, map.getOrDefault(c, 0) + 1);
+        }
         List<Map.Entry<Character, Integer>> list = new ArrayList<>(map.entrySet());
-        Collections.sort(list, (o1, o2) -> (o2.getValue()).compareTo(o1.getValue()));
+        Collections.sort(list, (o1, o2) -> (o2.getValue() - o1.getValue()));
         StringBuilder stringBuilder = new StringBuilder();
         for (Map.Entry<Character, Integer> entry : list) {
             for (int i = 0; i < entry.getValue(); i++) {