更新 '_posts/常用的代码块.md'

_posts/常用的代码块.md

@@ -41,6 +41,16 @@ private static Map<String, Object> sortByKey(Map<String, Object> map) {
 ```
 
 
+#### map 进行遍历
+
+```Java
+
+    for (Map.Entry<String, Object> m : map.entrySet()) {
+        System.out.println("key:" + m.getKey() + " value:" + m.getValue());
+    }
+    
+```
+