Java-設計模式-第八篇-建造者模式變種

本次所寫的builder模式有所不同

1. 變種的builder模式在完成基本類編寫後，無需手動編寫複雜的類！
2. 變種的builder模式意在簡化對象的構造過程，提升對對象的理解能力！
3. 本次builder模式需要使用到Intellij IDEA工具的一個插件

Builder Generator

準備

1. 插件安裝方法

• windows：快捷鍵—ctrl+alt+s 進入setting
• 點擊：plugins
• 選擇：Marketplace
• 輸入：Builder Generator
• 回車 點擊install
  

2. 編寫模型類

package com.imiros.build;

/**
 * 第二種變形的build模式
 *
 * @author zxq
 * @date 2019/6/10 11:21
 */
public class Build2 {
    private String name;
    private Integer age;
    private String gender;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

}

3. 生成內部類形式的builder構造器

• 在模型類中使用快捷鍵：alt+insert
• 選擇builder
  
• 選擇生成內部類，帶上所有的或者需要的對象屬性
  
• 需要的字段都要選擇
  
• 點擊確定生成

4. 效果：

package com.imiros.build;

/**
* 第二種變形的build模式
*
* @author zxq
* @date 2019/6/10 11:21
*/
public class Build2 {
   private String name;
   private Integer age;
   private String gender;

   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }

   public Integer getAge() {
       return age;
   }

   public void setAge(Integer age) {
       this.age = age;
   }

   public String getGender() {
       return gender;
   }

   public void setGender(String gender) {
       this.gender = gender;
   }

   public static final class Build2Builder {
       private String name;
       private Integer age;
       private String gender;

       private Build2Builder() {
       }

       public static Build2Builder aBuild2() {
           return new Build2Builder();
       }

       public Build2Builder withName(String name) {
           this.name = name;
           return this;
       }

       public Build2Builder withAge(Integer age) {
           this.age = age;
           return this;
       }

       public Build2Builder withGender(String gender) {
           this.gender = gender;
           return this;
       }

       public Build2 build() {
           Build2 build2 = new Build2();
           build2.setName(name);
           build2.setAge(age);
           build2.setGender(gender);
           return build2;
       }
   }
}

5. 使用方法

 Build2.Build2Builder builder = Build2.Build2Builder.aBuild2();
        Build2 build = builder.withName("小明").withAge(8).withGender("男性").build();
        System.out.println(build);

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