🎨 update

src/main/doc/学习笔记/Map遍历方法.md

@@ -38,4 +38,9 @@
     for (String v : map.values()) {
         System.out.println("value= " + v);
     }
+```
+```java
+    //第五种
+    System.out.println("通过lamda表达式遍历key和value：");
+    map.forEach((k, v) -> System.out.println("key = " + k + ", value = " + v));
 ```