diff --git a/Main.java b/Main.java
index 1a68b2dd0a36d3447eed91dc217b0ec3bb12c172..f185b399dd1727afed727fae872d035e2fd59bc3 100644
--- a/Main.java
+++ b/Main.java
@@ -1,5 +1,20 @@
+import javax.swing.text.Element;
+import javax.swing.text.DefaultStyledDocument.ElementSpec;
+
 class Main {
   public static void main(String[] args) {
-    System.out.println("Hello world!");
+    //关于分支结构的一种例题:if elseif的Demo
+    double price = 300;
+    if(price>=2000){
+      price*=0.5;
+    }else if(price>=1000){
+      price*=0.7;
+    }else if(price>=500){
+      price*=0.8;
+    }else {
+      price*=0.9;
+    }
+    System.out.println("最终的消费金额为"+price);
+    
   }
 }
\ No newline at end of file