diff --git a/src/main/java/com/github/hcsp/encapsulation/UserBuilder.java b/src/main/java/com/github/hcsp/encapsulation/UserBuilder.java
index e3d4a8c..c7fdbec 100644
--- a/src/main/java/com/github/hcsp/encapsulation/UserBuilder.java
+++ b/src/main/java/com/github/hcsp/encapsulation/UserBuilder.java
@@ -1,6 +1,39 @@
 package com.github.hcsp.encapsulation;
 
-public class UserBuilder {
-    // 请在这里使用builder模式建造User对象
-    // 所需的接口请参阅UserBuilderTest测试类
+public final class UserBuilder {
+    private String firstName;
+    private String lastName;
+    private String phoneNumber;
+    private String address;
+
+    private UserBuilder() {
+    }
+
+    public static UserBuilder anUser() {
+        return new UserBuilder();
+    }
+
+    public UserBuilder withFirstName(String firstName) {
+        this.firstName = firstName;
+        return this;
+    }
+
+    public UserBuilder withLastName(String lastName) {
+        this.lastName = lastName;
+        return this;
+    }
+
+    public UserBuilder withPhoneNumber(String phoneNumber) {
+        this.phoneNumber = phoneNumber;
+        return this;
+    }
+
+    public UserBuilder withAddress(String address) {
+        this.address = address;
+        return this;
+    }
+
+    public User build() {
+        return new User(firstName, lastName, phoneNumber, address);
+    }
 }