diff --git a/problems/0056.合并区间.md b/problems/0056.合并区间.md
index f42fced7..43ff447d 100644
--- a/problems/0056.合并区间.md
+++ b/problems/0056.合并区间.md
@@ -141,12 +141,7 @@ Java：
 class Solution {
     public int[][] merge(int[][] intervals) {
         List<int[]> res = new LinkedList<>();
-        Arrays.sort(intervals, new Comparator<int[]>() {
-            @Override
-            public int compare(int[] o1, int[] o2) {
-                return Integer.compare(o1[0], o2[0]);
-            }
-        });
+        Arrays.sort(intervals, (o1, o2) -> o1[0] - o2[0]);
 
         int start = intervals[0][0];
         for (int i = 1; i < intervals.length; i++) {