diff --git a/src/main/kotlin/com/sample/type/Book.kt b/src/main/kotlin/com/sample/type/Book.kt
index ff09c39..a15b3e5 100644
--- a/src/main/kotlin/com/sample/type/Book.kt
+++ b/src/main/kotlin/com/sample/type/Book.kt
@@ -1,3 +1,3 @@
 package com.sample.type
 
-class Book(val id: Int, val name: String, val author: String, val value: Int)
\ No newline at end of file
+data class Book(val id: Int, val name: String, val author: String, val value: Int)