The Builder Pattern

ahucoder · ahucoder · commit 1aef348ac93f · 2025-06-09T17:03:37.000+08:00
diff --git a/README.md b/README.md
@@ -15,11 +15,11 @@
 ### 创建型模式
 | 模式                                                   | 描述 | 示例 |
 |------------------------------------------------------|------|------|
-| [单例 (Singleton)](src/main/java/creational/singleton)            | 确保一个类只有一个实例 | 数据库连接池 |
-| [工厂方法 (Factory Method)]()                        | 创建对象而不指定具体类 | UI 跨平台组件创建 |
-| [抽象工厂 (Abstract Factory)]()                      | 创建相关对象族 | 跨平台 UI 组件套件 |
-| [建造者 (Builder)]()    | 分步构建复杂对象 | SQL 查询构建器 |
-| [原型 (Prototype)]() | 通过克隆创建对象 | 游戏角色复制 |
+| [单例 (Singleton)](src/main/java/creational/singleton) | 确保一个类只有一个实例 | 数据库连接池 |
+| [工厂方法 (Factory Method)]()                            | 创建对象而不指定具体类 | UI 跨平台组件创建 |
+| [抽象工厂 (Abstract Factory)]()                          | 创建相关对象族 | 跨平台 UI 组件套件 |
+| [建造者 (Builder)](src/main/java/creational/builder)    | 分步构建复杂对象 | SQL 查询构建器 |
+| [原型 (Prototype)]()                                   | 通过克隆创建对象 | 游戏角色复制 |
 
 ### 结构型模式
 | 模式 | 描述 | 示例 |
diff --git a/src/main/java/creational/builder/App.java b/src/main/java/creational/builder/App.java
@@ -0,0 +1,12 @@
+package creational.builder;
+
+public class App {
+    public static void main(String[] args) {
+        House seaviewHouse = new House.Builder("Concrete", "Brick", "A")
+                .hasSwimmingPool(true)
+                .hasGarage(true)
+                .hasGarden(true)
+                .build();
+        System.out.println(seaviewHouse);
+    }
+}
diff --git a/src/main/java/creational/builder/House.java b/src/main/java/creational/builder/House.java
@@ -0,0 +1,68 @@
+package creational.builder;
+
+import lombok.Getter;
+
+@Getter
+public class House {
+    private final String material;
+    private final String structure;
+    private final String roof;
+    private final boolean hasGarage;
+    private final boolean hasSwimmingPool;
+    private final boolean hasGarden;
+
+    public House(Builder builder) {
+        this.material = builder.material;
+        this.structure = builder.structure;
+        this.roof = builder.roof;
+        this.hasGarage = builder.hasGarage;
+        this.hasSwimmingPool = builder.hasSwimmingPool;
+        this.hasGarden = builder.hasGarden;
+    }
+
+    @Override
+    public String toString() {
+        return "House{" +
+                "material='" + material + '\'' +
+                ", structure='" + structure + '\'' +
+                ", roof='" + roof + '\'' +
+                ", hasGarage=" + hasGarage +
+                ", hasSwimmingPool=" + hasSwimmingPool +
+                ", hasGarden=" + hasGarden +
+                '}';
+    }
+
+    public static class Builder {
+        private final String material;
+        private final String structure;
+        private final String roof;
+        private boolean hasGarage;
+        private boolean hasSwimmingPool;
+        private boolean hasGarden;
+
+        public Builder(String material, String structure, String roof) {
+            this.material = material;
+            this.structure = structure;
+            this.roof = roof;
+        }
+
+        public Builder hasGarage(boolean hasGarage) {
+            this.hasGarage = hasGarage;
+            return this;
+        }
+
+        public Builder hasSwimmingPool(boolean hasSwimmingPool) {
+            this.hasGarage = hasSwimmingPool;
+            return this;
+        }
+
+        public Builder hasGarden(boolean hasGarden) {
+            this.hasGarden = hasGarden;
+            return this;
+        }
+
+        public House build() {
+            return new House(this);
+        }
+    }
+}
