diff --git a/day06/src/com/inmind/object01/Demo01.java b/day06/src/com/inmind/object01/Demo01.java
index 5ddd74c..83b4895 100644
--- a/day06/src/com/inmind/object01/Demo01.java
+++ b/day06/src/com/inmind/object01/Demo01.java
@@ -30,7 +30,7 @@ public class Demo01 {
          */
         //学生对象的属性和行为的操作
         //学生对象的属性值的设置
-        s.name = "张三";
+        /*s.name = "张三";
         s.age = 22;
         s.id = 10;
         s.gender = "男生";
@@ -38,7 +38,7 @@ public class Demo01 {
         //学生对象的属性值的获取
         System.out.println(s.name);
         System.out.println(s.score);
-        System.out.println(s.gender);
+        System.out.println(s.gender);*/
 
         //调用学生对象的行为（成员方法）
         s.eat("肯德基");
diff --git a/day06/src/com/inmind/object01/Demo02.java b/day06/src/com/inmind/object01/Demo02.java
index ee4d401..672edb4 100644
--- a/day06/src/com/inmind/object01/Demo02.java
+++ b/day06/src/com/inmind/object01/Demo02.java
@@ -4,14 +4,8 @@ public class Demo02 {
     public static void main(String[] args) {
         //创建2个学生
         Student s1 = new Student();
-        s1.name = "张三";
-        s1.age = 23;
-        s1.id = 3;
         s1.study("java");
         Student s2 = new Student();
-        s2.name = "李四";
-        s2.age = 2;
-        s2.id = 5;
         s2.study("python");
     }
 }
diff --git a/day06/src/com/inmind/object01/Demo04.java b/day06/src/com/inmind/object01/Demo04.java
new file mode 100644
index 0000000..e48615d
--- /dev/null
+++ b/day06/src/com/inmind/object01/Demo04.java
@@ -0,0 +1,23 @@
+package com.inmind.object01;
+/*
+面向对象之封装的作用：类的安全性
+
+如何封装呢？？
+1.使用private关键字修饰成员变量
+2.使用get/setXXX方法来对private修饰的成员变量，进行取值和赋值
+ */
+public class Demo04 {
+    public static void main(String[] args) {
+        //创建一个学生，并给学生设置属性值，展示该学生
+        Student s = new Student();
+        //设置属性
+        //s.name = "张三";
+        s.setName("张三");
+        //s.age = -23;//有点不安全
+        s.setAge(23);
+        System.out.println(s.getName());
+        System.out.println(s.getAge());
+        s.show();
+
+    }
+}
diff --git a/day06/src/com/inmind/object01/Student.java b/day06/src/com/inmind/object01/Student.java
index ab4c67a..579f02a 100644
--- a/day06/src/com/inmind/object01/Student.java
+++ b/day06/src/com/inmind/object01/Student.java
@@ -9,15 +9,40 @@ public class Student {
 
     //特征
     //姓名
-    String name;
+    private String name;
     //年龄
-    int age;
+    private int age = 18;
     //学号
-    int id;
+    private int id;
     //性别
-    String gender;
+    private String gender;
     //成绩
-    double score;
+    private double score;
+
+
+    //使用get/setXXX方法来对private修饰的成员变量，进行取值和赋值
+
+    public String getName(){
+        return name;
+    }
+
+    public void setName(String s){
+        name = s;//对属性进行赋值
+    }
+
+    public int getAge(){
+        return age;
+    }
+
+    public void setAge(int a){
+        if (a < 0||a >100) {
+            System.out.println("您传递的年龄有误，只能是0~100的值");
+            //不对当前的属性进行赋值(让方法提前结束)
+            return;//结束方法，如果有返回值，就会把值返回
+        }
+        age = a;//对属性进行赋值
+    }
+
 
     //行为(在描述一类事物时，设置的方法就不要加static)
 
@@ -35,4 +60,8 @@ public class Student {
     public void study(String book) {
         System.out.println(name+"学生在学习，学"+book);
     }
+
+    public void show() {
+        System.out.println("我叫"+name+"，今年"+age+"岁");
+    }
 }