diff --git a/day06/src/com/inmind/private02/Demo03.java b/day06/src/com/inmind/private02/Demo03.java
new file mode 100644
index 0000000..dfc4278
--- /dev/null
+++ b/day06/src/com/inmind/private02/Demo03.java
@@ -0,0 +1,24 @@
+package com.inmind.private02;
+/*
+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 Demo03 {
+    public static void main(String[] args) {
+        //创建学生类对象
+        Student s = new Student();
+        //属性被private修饰，不能直接访问，只能通过方法间接访问
+        //s.name = "张三";
+        //s.age = -18;
+        //s.id = 2;
+        //针对私有化的属性进行取值赋值
+        s.setAge(18);
+        s.setName("张三");
+        s.setId(2);
+        s.study("SQL");
+
+    }
+}
diff --git a/day06/src/com/inmind/private02/Student.java b/day06/src/com/inmind/private02/Student.java
new file mode 100644
index 0000000..b229601
--- /dev/null
+++ b/day06/src/com/inmind/private02/Student.java
@@ -0,0 +1,46 @@
+package com.inmind.private02;
+
+public class Student {
+    private String name;
+    private int age;
+    private int id;
+
+    //获取年龄
+    public int getAge(){
+        return age;
+    }
+
+    //设置年龄
+    public void setAge(int a){
+        if (a >= 0 && a <= 120) {
+            age = a;
+        } else {
+            System.out.println("年龄不合法，请输入0~120的年龄");
+        }
+    }
+
+    public int getId(){
+        return id;
+    }
+
+    //设置年龄
+    public void setId(int b){
+            id = b;
+    }
+
+
+    public String getName(){
+        return name;
+    }
+
+    //设置年龄
+    public void setName(String n){
+        name = n;
+    }
+
+
+    //学习
+    public void study(String book){
+        System.out.println("姓名为"+name+"的"+age+"岁的学生正在学习"+book);
+    }
+}