build重叠构造器有利于参数扩展 并发下比javabean方式安全更高 推荐使用

import lombok.*;
import org.springframework.beans.BeanUtils;

/*
 * @author Lee
 * @description 主要用于当参数非常多的时候 进行更改不会影响原有构造 比javabean 的方法更安全
 * @date 2019/2/18 14:29
 * @param
 * @return
 **/

//可以使用lombok的注解
//@Builder
@ToString
@Getter
@Setter
public class Car {
    private int age;
    private String name;
    private String des;
    private String year;
    private String mouth;
    private String day;

    public static class CarBuilder{
        private int age;
        private String name;
        private String des;
        private String year;
        private String mouth;
        private String day;


        public CarBuilder setAge(int age) {
            this.age = age;
            return this;
        }

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

        public CarBuilder setDes(String des) {
            this.des = des;
            return this;
        }

        public CarBuilder setYear(String year) {
            this.year = year;
            return this;
        }

        public CarBuilder setMouth(String mouth) {
            this.mouth = mouth;
            return this;
        }

        public CarBuilder setDay(String day) {
            this.day = day;
            return this;
        }

        public Car build(){
            Car car = new Car();
            car.setDay(day);
            car.setAge(age);
            car.setDes(des);
            car.setMouth(mouth);
            car.setName(name);
            car.setYear(year);
            return car;
        }
    }
}

 public class CarTest {
    @Test
    public void test01(){
        Car car = new Car.CarBuilder().setAge(1).setDay("20").setDes("12312sddasd").build();
        System.out.println(car);
    }
}