diff --git a/day02/src/com/inmind/operator02/Demo11.java b/day02/src/com/inmind/operator02/Demo11.java
new file mode 100644
index 0000000..161d170
--- /dev/null
+++ b/day02/src/com/inmind/operator02/Demo11.java
@@ -0,0 +1,33 @@
+package com.inmind.operator02;
+/*
+运算符_逻辑运算符
+&& : 双与  短路与   并且
+|| ：双或  短路或	或者
+!  : 非             取反
+
+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 Demo11 {
+    public static void main(String[] args) {
+        //双与：一假即假(并且)
+        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("------------------------------");
+        int a = 10;
+        int b = 20;
+        System.out.println((++a > 10)  || (++b > 20));//true
+        System.out.println(a);//11
+        System.out.println(b);//20
+    }
+}