diff --git a/pom.xml b/pom.xml
index c20b489..5f64ed4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -58,6 +58,11 @@
             <version>1.2.58</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>com.google.code.gson</groupId>
+            <artifactId>gson</artifactId>
+            <version>2.9.0</version>
+        </dependency>
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter-api</artifactId>
diff --git a/src/main/java/com/github/hcsp/encapsulation/Main.java b/src/main/java/com/github/hcsp/encapsulation/Main.java
index 51ce4a1..c08562e 100644
--- a/src/main/java/com/github/hcsp/encapsulation/Main.java
+++ b/src/main/java/com/github/hcsp/encapsulation/Main.java
@@ -1,32 +1,42 @@
 package com.github.hcsp.encapsulation;
 
+import com.google.gson.Gson;
+
 public class Main {
-    /*
-         假设你正在为学校开发一个学生分数记录系统
-         你和前端约定的JSON接口格式是：
-         {
-           "name": "张三",
-           "retakingExam": true,
-           "score": 59,
-           "fail": true // 是否挂科，如果分数低于60则返回true，代表挂科
-         }
-         请：
-         1. 设计并完成Student类
-         2. 挑选一种你喜欢的JSON类库，完成序列化/反序列化的方法
-    */
-    public static void main(String[] args) {
-        Student student = new Student();
-        student.setName("张三");
-        student.setScore(60);
-        student.setRetakingExam(true);
-        String json = serialize(student);
+  /*
+       假设你正在为学校开发一个学生分数记录系统
+       你和前端约定的JSON接口格式是：
+       {
+         "name": "张三",
+         "retakingExam": true,
+         "score": 59,
+         "fail": true // 是否挂科，如果分数低于60则返回true，代表挂科
+       }
+       请：
+       1. 设计并完成Student类
+       2. 挑选一种你喜欢的JSON类库，完成序列化/反序列化的方法
+  */
+  public static void main(String[] args) {
+    Student student = new Student();
+    student.setName("张三");
+    student.setScore(60);
+    student.setRetakingExam(true);
+    String json = serialize(student);
+
+    System.out.println(json);
+
+    student = deserialize(json);
+  }
 
-        System.out.println(json);
+  // 序列化：将Student类转换成JSON字符串
+  public static String serialize(Student student) {
+    Gson gson = new Gson();
+    return gson.toJson(student);
+  }
 
-        student = deserialize(json);
-    }
-    // 序列化：将Student类转换成JSON字符串
-    public static String serialize(Student student) {}
-    // 反序列化：将JSON字符串转换成Student对象
-    public static Student deserialize(String json) {}
+  // 反序列化：将JSON字符串转换成Student对象
+  public static Student deserialize(String json) {
+    Gson gson = new Gson();
+    return gson.fromJson(json, Student.class);
+  }
 }
diff --git a/src/main/java/com/github/hcsp/encapsulation/Student.java b/src/main/java/com/github/hcsp/encapsulation/Student.java
index 85d2f55..92087e2 100644
--- a/src/main/java/com/github/hcsp/encapsulation/Student.java
+++ b/src/main/java/com/github/hcsp/encapsulation/Student.java
@@ -8,6 +8,35 @@ public class Student {
     /** 是否重考。true为重考，falase为非重考。 */
     private boolean retakingExam;
 
+    public boolean isFail() {
+        return score < 60;
+    }
+
+
     /** 分数 */
     private int score;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public boolean isRetakingExam() {
+        return retakingExam;
+    }
+
+    public void setRetakingExam(boolean retakingExam) {
+        this.retakingExam = retakingExam;
+    }
+
+    public int getScore() {
+        return score;
+    }
+
+    public void setScore(int score) {
+        this.score = score;
+    }
 }
diff --git a/src/test/java/com/github/hcsp/encapsulation/Main.java b/src/test/java/com/github/hcsp/encapsulation/Main.java
new file mode 100644
index 0000000..db8a942
--- /dev/null
+++ b/src/test/java/com/github/hcsp/encapsulation/Main.java
@@ -0,0 +1,36 @@
+package com.github.hcsp.encapsulation;
+
+public class Main {
+    /*
+         假设你正在为学校开发一个学生分数记录系统
+         你和前端约定的JSON接口格式是：
+         {
+           "name": "张三",
+           "retakingExam": true,
+           "score": 59,
+           "fail": true // 是否挂科，如果分数低于60则返回true，代表挂科
+         }
+         请：
+         1. 设计并完成Student类
+         2. 挑选一种你喜欢的JSON类库，完成序列化/反序列化的方法
+    */
+    public static void main(String[] args) {
+        Student student = new Student();
+        student.setName("张三");
+        student.setScore(60);
+        student.setRetakingExam(true);
+        String json = serialize(student);
+
+        System.out.println(json);
+
+        student = deserialize(json);
+    }
+    // 序列化：将Student类转换成JSON字符串
+    public static String serialize(Student student) {
+        return com.alibaba.fastjson.JSON.toJSONString(student);
+    }
+    // 反序列化：将JSON字符串转换成Student对象
+    public static Student deserialize(String json) {
+        return com.alibaba.fastjson.JSON.parseObject(json, Student.class);
+    }
+}