diff --git a/day02/src/com/inmind/yunsuanfu02/Demo08.java b/day02/src/com/inmind/yunsuanfu02/Demo08.java
new file mode 100644
index 0000000..942e9de
--- /dev/null
+++ b/day02/src/com/inmind/yunsuanfu02/Demo08.java
@@ -0,0 +1,15 @@
+package com.inmind.yunsuanfu02;
+/*
+运算符_比较运算符
+==,>,< ,>=,<=,!=
+*/
+public class Demo08 {
+    public static void main(String[] args) {
+        System.out.println(1==1);//true
+        System.out.println(1<2);//true
+        System.out.println(3>4);//false
+        System.out.println(3<=4);//true
+        System.out.println(3>=4);//false
+        System.out.println(3!=4);//true
+    }
+}
diff --git a/day02/src/com/inmind/yunsuanfu02/Demo09.java b/day02/src/com/inmind/yunsuanfu02/Demo09.java
new file mode 100644
index 0000000..37c79a4
--- /dev/null
+++ b/day02/src/com/inmind/yunsuanfu02/Demo09.java
@@ -0,0 +1,41 @@
+package com.inmind.yunsuanfu02;
+/*
+运算符_逻辑运算符
+&& : 双与  短路与   并且
+|| ：双或  短路与	或者
+!  : 非             取反
+
+注意：逻辑运算符经常与比较运算符结合使用！！！
+
+短路效果：双与与双或的短路效果(只要已经有确定的结果，就不要做多余的操作)
+ */
+public class Demo09 {
+    public static void main(String[] args) {
+        //双与：一假即假
+        System.out.println(true&&true);//true
+        System.out.println(true&&false);//false
+        System.out.println(false&&false);//false
+
+        //双或:一真即真
+        System.out.println(true||true);//true
+        System.out.println(true||false);//true
+        System.out.println(false||true);//true
+        System.out.println(false||false);//false
+        //非:取反
+        System.out.println(!false);//true
+        System.out.println(!!false);//false
+        System.out.println("--------------------------");
+        //判断一个小学生是否得了100
+        int math = 100;
+        int chinese = 99;
+        System.out.println((math == 100)||(chinese==100));//false
+
+        System.out.println("-----------以下是短路效果-----------");
+        int i = 10;
+        int j = 20;
+        //短路效果：双与与双或的短路效果(只要已经有确定的结果，就不要做多余的操作)
+        System.out.println(i<j && i++ > ++j);//false
+        System.out.println(i);//11
+        System.out.println(j);//21
+    }
+}