diff --git a/Main.java b/Main.java
index 1a68b2dd0a36d3447eed91dc217b0ec3bb12c172..d2b384ba2efeb037574b10afc44775b08fb7a204 100644
--- a/Main.java
+++ b/Main.java
@@ -1,5 +1,15 @@
 class Main {
   public static void main(String[] args) {
-    System.out.println("Hello world!");
+    System.out.println("内部类(成员)的使用");
+
+    Main m = new Main();
+   m.new A();
+  }
+  int n;
+  class A{
+    A(){
+      n=1000;
+      System.out.println(n);
+    }
   }
 }
\ No newline at end of file