Java设计模式：构建者模式

构建复杂对象

代码结构

源码

package com.myspringboot.shejimoshi.goujianzhe;

public class Main {
    public static void main(String[] args) {
        Person person = Person.asBuilder()
                .basicInfo(1, "zhangsan", 18)
                .score(20)
                .weight(120)
                .loc("bj", "23")
                .build();
        System.out.println(person);
    }
}

package com.myspringboot.shejimoshi.goujianzhe;

public class Person {
    int id;
    String name;
    int age;
    double weight;
    int score;
    Location loc;

    private Person() {
    }

    public static PersonBuilder asBuilder() {
        return new PersonBuilder();
    }

    @Override
    public String toString() {
        return "Person{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", weight=" + weight +
                ", score=" + score +
                ", loc=" + loc +
                '}';
    }

    public static class PersonBuilder {
        Person p = new Person();

        public PersonBuilder basicInfo(int id, String name, int age) {
            p.id = id;
            p.name = name;
            p.age = age;
            return this;
        }

        public PersonBuilder weight(double weight) {
            p.weight = weight;
            return this;
        }

        public PersonBuilder score(int score) {
            p.score = score;
            return this;
        }

        public PersonBuilder loc(String street, String roomNo) {
            p.loc = new Location(street, roomNo);
            return this;
        }

        public Person build() {
            return p;
        }
    }
}

class Location {
    String street;
    String roomNo;

    public Location(String street, String roomNo) {
        this.street = street;
        this.roomNo = roomNo;
    }

    @Override
    public String toString() {
        return "Location{" +
                "street='" + street + '\'' +
                ", roomNo='" + roomNo + '\'' +
                '}';
    }
}