builder pattern

src/main/java/com/github/hcsp/encapsulation/UserBuilder.java

@@ -3,4 +3,33 @@
 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
+    private String firstName;
+    private String lastName;
+    private String phoneNumber;
+    private String address;
+
+    public static UserBuilder anUser() {
+        return new UserBuilder();
+    }
+
+    public UserBuilder firstName (String s) {
+        this.firstName = s;
+        return this;
+    }
+    public UserBuilder lastName (String s) {
+        this.lastName = s;
+        return this;
+    }
+    public UserBuilder phoneNumber (String s) {
+        this.phoneNumber = s;
+        return this;
+    }
+    public UserBuilder address (String s) {
+        this.address = s;
+        return this;
+    }
+
+    public User build() {
+        return new User(firstName, lastName, phoneNumber, address);
+    }
 }

src/main/java/com/github/hcsp/encapsulation/UserXXXBuilder.java

@@ -0,0 +1,39 @@
+package com.github.hcsp.encapsulation;
+
+public final class UserXXXBuilder {
+    private String firstName;
+    private String lastName;
+    private String phoneNumber;
+    private String address;
+
+    private UserXXXBuilder() {
+    }
+
+    public static UserXXXBuilder anUser() {
+        return new UserXXXBuilder();
+    }
+
+    public UserXXXBuilder withFirstName(String firstName) {
+        this.firstName = firstName;
+        return this;
+    }
+
+    public UserXXXBuilder withLastName(String lastName) {
+        this.lastName = lastName;
+        return this;
+    }
+
+    public UserXXXBuilder withPhoneNumber(String phoneNumber) {
+        this.phoneNumber = phoneNumber;
+        return this;
+    }
+
+    public UserXXXBuilder withAddress(String address) {
+        this.address = address;
+        return this;
+    }
+
+    public User build() {
+        return new User(firstName, lastName, phoneNumber, address);
+    }
+}