diff --git a/src/senior/Exception/RainException.kt b/src/senior/Exception/RainException.kt
index 92662ea..3596cb2 100644
--- a/src/senior/Exception/RainException.kt
+++ b/src/senior/Exception/RainException.kt
@@ -4,6 +4,8 @@ class RainException(override val message: String?) : Throwable() {
 }
 
 fun main(args: Array<String>) {
-    var name: String? = null
+    var name: String? = "null"
     name?.length ?: throw RainException("rain自定义异常")
+
+    println("name.length = ${name.length}")
 }
\ No newline at end of file