diff --git a/src/main/scala/demo1/DemoVar.scala b/src/main/scala/chapter1/demo1/DemoVar.scala
similarity index 96%
rename from src/main/scala/demo1/DemoVar.scala
rename to src/main/scala/chapter1/demo1/DemoVar.scala
index 816429e..6c5dc3e 100644
--- a/src/main/scala/demo1/DemoVar.scala
+++ b/src/main/scala/chapter1/demo1/DemoVar.scala
@@ -1,4 +1,4 @@
-package demo1
+package chapter1.demo1
 
 object DemoVar {
   def main(args: Array[String]): Unit = {
diff --git a/src/main/scala/demo2/DemoStr.scala b/src/main/scala/chapter1/demo2/DemoStr.scala
similarity index 96%
rename from src/main/scala/demo2/DemoStr.scala
rename to src/main/scala/chapter1/demo2/DemoStr.scala
index 32a20dd..dbae2c7 100644
--- a/src/main/scala/demo2/DemoStr.scala
+++ b/src/main/scala/chapter1/demo2/DemoStr.scala
@@ -1,4 +1,4 @@
-package demo2
+package chapter1.demo2
 
 object DemoStr {
   def main(args: Array[String]): Unit = {
diff --git a/src/main/scala/demo2/DemoVar2.scala b/src/main/scala/chapter1/demo2/DemoVar2.scala
similarity index 97%
rename from src/main/scala/demo2/DemoVar2.scala
rename to src/main/scala/chapter1/demo2/DemoVar2.scala
index 10a40fd..7e82fc7 100644
--- a/src/main/scala/demo2/DemoVar2.scala
+++ b/src/main/scala/chapter1/demo2/DemoVar2.scala
@@ -1,4 +1,4 @@
-package demo2
+package chapter1.demo2
 
 object DemoVar2 {
   def main(args: Array[String]): Unit = {
diff --git a/src/main/scala/chapter1/demo3/DemoOps.scala b/src/main/scala/chapter1/demo3/DemoOps.scala
new file mode 100644
index 0000000..0d54cf0
--- /dev/null
+++ b/src/main/scala/chapter1/demo3/DemoOps.scala
@@ -0,0 +1,60 @@
+package chapter1.demo3
+
+object DemoOps {
+  def main(args: Array[String]): Unit = {
+    // 1. 算术运算符
+    val result1: Int = 10 / 3 // 3
+    println(s"result1 = ${result1}") //不能整除，取整数部分
+
+    val result2: Double = 10 / 3
+    println(s"result2 = ${result2}") // 两个整数做除法，结果也是整数，赋值给result2时，转成double 10/3 = 3 ==> 3.0
+
+    val result3: Double = 10.0 / 3
+    println(s"result3 = ${result3}") // double除以整型  10.0 / 3 ==> 10.0/3.0 ==> 3.33333
+
+    val result4: Int = (+10) + (-3)
+    println(s"result4 = ${result4}")
+
+    // 2. 比较运算符
+    val a1: Int = 10
+    val b1: Int = 10
+    println(s"a1==b1 = ${a1 == b1}")
+    println(s"a1.equals(b1) = ${a1.equals(b1)}")
+    println(s"a1!=b1 = ${a1 != b1}")
+    println(s"a1>b1 = ${a1 > b1}")
+    println(s"a1>=b1 = ${a1 >= b1}")
+
+
+    // 3. 逻辑运算符
+    val n = 1
+    println((6 > 5) && (n > 0)) // true
+    println((6 > 5) && (n < 0)) // false
+    println((6 > 5) || (n > 0))
+    println((6 > 5) || (n < 0))
+    println(!((6 > 5) && (n > 0)))
+
+
+    // 4. 赋值运算符
+    var a = 10
+    a += 1 // a = a + 1
+    println(a)
+    a -= 1
+    a /= 1
+    a %= 1
+
+    a <<= 1 // a = a << 1
+
+    a &= 1 // a = a & 1  // 按位与 运算
+    a |= 1 // a = a | 1  // 按位或 运算
+    a ^= 1 // a = a ^ 1  // 异或 运算
+
+
+    val b = 10
+    val c = b + a
+
+    val d = b.+(a)
+    // b.add(a)
+    val e = b +(a)
+    val f = b +a
+  }
+}
diff --git a/src/main/scala/demo3/DemoOps.scala b/src/main/scala/demo3/DemoOps.scala
deleted file mode 100644
index 6b1c878..0000000
--- a/src/main/scala/demo3/DemoOps.scala
+++ /dev/null
@@ -1,48 +0,0 @@
-package demo3
-
-object DemoOps {
-  def main(args: Array[String]): Unit = {
-
-    // 1.算术运算符
-    val result1: Int = 10 / 3 //3
-    println(s"result1 = ${result1}") //不能整除，取整数部分
-
-    val result2: Double = 10 / 3
-    println(s"result2 = ${result2}") // 两个整数做除法，结果也是证书，赋值给result2时，转成double 10/3 = 3 == 3。0
-
-    val result3: Double = 10.0 / 3
-    println(s"result3 = ${result3}") // double除以整形 10.3 / 3 ==> 10.0/3.0 ==> 3.33333
-
-    val result4: Int = (+10) + (-3)
-    println(s"result4 = ${result4}")
-
-    // 2.比较运算符
-    val a1: Int = 10
-    val b1: Int = 10
-    println(s"a1==b1 = ${a1 == b1}")
-    println(s"a1.equals(b1) = ${a1.equals(b1)}")
-    println(s"a1 != b1 = ${a1 != b1}")
-    println(s"a1>b1 = ${a1 > b1}")
-    println(s"a1 >= b1 = ${a1 >= b1}")
-
-    // 3.逻辑运算符
-    val n = 1
-    println((6 > 5) && (n > 0))
-    println((6 > 5) && (n < 0))
-    println((6 > 5) || (n > 0))
-    println((6 > 5) || (n < 0))
-    println(!((6 > 5) && (n > 0)))
-
-    // 4.赋值运算符
-    var a = 10
-    a += 1 // a = a + 1
-    println(a)
-    a -= 1
-    a /= 1
-    a %= 1
-
-
-
-  }
-
-}