Builder模式-优快云博客

本文链接：https://blog.youkuaiyun.com/DarkfallYou/article/details/88964900

本文介绍了一种使用Builder模式创建复杂对象的方法，并提供了一个具体的实现案例。通过该模式，可以灵活地构造具有多个可选属性的对象实例。

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Builder模式自动生成插件，Android Studio中Plugins下搜索InnerBuilder。

常用的Builder模式示例如下：

public class People {

    private final String firstName;//必选
    private final String secondName;//必选
    private final int age;//可选
    private final String gender;//可选
    private final String mobile;//可选

    private People(PeopleBuilder builder){
        this.firstName = builder.mFirstName;
        this.secondName = builder.mSecondName;
        this.age = builder.mAge;
        this.gender = builder.mGender;
        this.mobile = builder.mMobile;
    }

    public String getFirstName() {
        return firstName;
    }

    public String getSecondName() {
        return secondName;
    }

    public int getAge() {
        return age;
    }

    public String getGender() {
        return gender;
    }

    public String getMobile() {
        return mobile;
    }
    
    public static class PeopleBuilder {
        private final String mFirstName;
        private final String mSecondName;
        private int mAge;
        private String mGender;
        private String mMobile;

        public PeopleBuilder(String mFirstName, String mSecondName) {
            this.mFirstName = mFirstName;
            this.mSecondName = mSecondName;
        }

        public PeopleBuilder age(int mAge) {
            this.mAge = mAge;
            return this;
        }

        public PeopleBuilder gender(String mGender) {
            this.mGender = mGender;
            return this;
        }

        public PeopleBuilder mobile(String mMobile) {
            this.mMobile = mMobile;
            return this;
        }

        public People build() {
            return new People(this);
        }
    }
}