更新 '_posts/常用的代码块.md'

_posts/常用的代码块.md

@@ -39,7 +39,7 @@ private static Map<String, Object> sortByKey(Map<String, Object> map) {
     Map<Object,List<Object>> map = demoList.stream().collect(Collectors.groupingBy(Object::getAttr));
     //2 按照多个字段
     Map<String, List<Object>> groupBy = objectList.stream().collect(Collectors
-    .groupingBy(o -> o.getApplyId() + "_" + o.getSkuId()));
+    .groupingBy(o -> o.getAttr1() + "_" + o.getAttr2()));
 
 ```