diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..7454180
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..2e6e589
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.3-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/src/main/kotlin/Demo1/InitAndSingleton.kt b/src/main/kotlin/Demo1/InitAndSingleton.kt
new file mode 100644
index 0000000..717eec8
--- /dev/null
+++ b/src/main/kotlin/Demo1/InitAndSingleton.kt
@@ -0,0 +1,39 @@
+package Demo1
+
+class InitAndSingleton{
+	//初始化
+	init{
+		println("init")
+	}
+	//带参构造方法
+	constructor(data:String){
+		println("data = ${data}")
+	}
+	//构造方法
+	constructor(){
+		println("not parma")
+	}
+
+	//定义静态方法
+	 companion object{
+		//方法实现
+        fun function() {
+			println("is Function")
+        }
+    }
+
+}
+
+fun main() {
+	InitAndSingleton()
+	InitAndSingleton("uname")
+	InitAndSingleton.function()
+
+}
+/** out **
+init
+not parma
+init
+data = uname
+is Function
+ **/
\ No newline at end of file
diff --git a/src/main/kotlin/InitAndSingleton.kt b/src/main/kotlin/InitAndSingleton.kt
deleted file mode 100644
index 9f09432..0000000
--- a/src/main/kotlin/InitAndSingleton.kt
+++ /dev/null
@@ -1,13 +0,0 @@
-class InitAndSingleton{
-	//初始化
-	init{
-		println("init")
-	}
-	//定义静态方法
-	 companion object{
-		//方法实现
-        fun function(){
-            
-        }
-    }
-}
\ No newline at end of file