JAVA 8 巧妙对象实例化复制操作

package com.study.newobject.now;

import java.util.ArrayList;
import java.util.List;
import java.util.function.Consumer;
import java.util.function.Supplier;

/***
 * @ClassName: Builder
 * @Description:
 * @Auther: pengbaowei
 * @Date: 2020/1/20
 * @version : V1.0
 */
public class Builder<T> {

    private final Supplier<T> instantiator;

    private List<Consumer<T>> modifiers = new ArrayList<>();

    public Builder(Supplier<T> instantiator) {
        this.instantiator = instantiator;
    }
    public static <T> Builder<T> of(Supplier<T> instantiator) {
        return new Builder<>(instantiator);
    }
    public <P1> Builder<T> with(Consumer1<T, P1> consumer, P1 p1) {
        Consumer<T> c = instance -> consumer.accept(instance, p1);
        modifiers.add(c);
        return this;
    }
    public <P1, P2> Builder<T> with(Consumer2<T, P1, P2> consumer, P1 p1, P2 p2) {
        Consumer<T> c = instance -> consumer.accept(instance, p1, p2);
        modifiers.add(c);
        return this;
    }
    public <P1, P2, P3> Builder<T> with(Consumer3<T, P1, P2, P3> consumer, P1 p1, P2 p2, P3 p3) {
        Consumer<T> c = instance -> consumer.accept(instance, p1, p2, p3);
        modifiers.add(c);
        return this;
    }
    public T build() {
        T value = instantiator.get();
        modifiers.forEach(modifier -> modifier.accept(value));
        modifiers.clear();
        return value;
    }
    /**
     * 1 参数 Consumer
     */
    @FunctionalInterface
    public interface Consumer1<T, P1> {
        void accept(T t, P1 p1);
    }
    /**
     * 2 参数 Consumer
     */
    @FunctionalInterface
    public interface Consumer2<T, P1, P2> {
        void accept(T t, P1 p1, P2 p2);
    }
    /**
     * 3 参数 Consumer
     */
    @FunctionalInterface
    public interface Consumer3<T, P1, P2, P3> {
        void accept(T t, P1 p1, P2 p2, P3 p3);
    }
}

　　

package com.study.newobject.old;

import lombok.Data;

import java.util.*;

/***
 * @ClassName: GirlFriend
 * @Description:
 * @Auther: pengbaowei
 * @Date: 2020/1/20
 * @version : V1.0
 */
@Data
public class GirlFriend {
    private String name;
    private int age;
    private int bust;
    private int waist;
    private int hips;
    private List<String> hobby;
    private String birthday;
    private String address;
    private String mobile;
    private String email;
    private String hairColor;
    private Map<String, String> gift;


    public void addHobby(String hobby) {
        this.hobby = Optional.ofNullable(this.hobby).orElse(new ArrayList<>());
        this.hobby.add(hobby);
    }
    public void addGift(String day, String gift) {
        this.gift = Optional.ofNullable(this.gift).orElse(new HashMap<>());
        this.gift.put(day, gift);
    }
    public void setVitalStatistics(int bust, int waist, int hips) {
        this.bust = bust;
        this.waist = waist;
        this.hips = hips;
    }

    public static void main(String[] args) {
        GirlFriend myGirlFriend = new GirlFriend();
        myGirlFriend.setName("小美");
        myGirlFriend.setAge(18);
        myGirlFriend.setBust(33);
        myGirlFriend.setWaist(23);
        myGirlFriend.setHips(33);
        myGirlFriend.setBirthday("2001-10-26");
        myGirlFriend.setAddress("上海浦东");
        myGirlFriend.setMobile("18688888888");
        myGirlFriend.setEmail("[e-mail]");
        myGirlFriend.setHairColor("浅棕色带点微卷");
        List<String> hobby = new ArrayList<>();
        hobby.add("逛街");
        hobby.add("购物");
        hobby.add("买东西");
        myGirlFriend.setHobby(hobby);
        Map<String, String> gift = new HashMap<>();
        gift.put("情人节礼物", "LBR 1912女王时代");
        gift.put("生日礼物", "迪奥烈焰蓝金");
        gift.put("纪念日礼物", "阿玛尼红管唇釉");
        myGirlFriend.setGift(gift);
    }
}

package com.study.newobject;

import com.study.newobject.now.Builder;
import com.study.newobject.old.GirlFriend;

/***
 * @ClassName: TestMain
 * @Description:
 * @Auther: pengbaowei
 * @Date: 2020/1/20
 * @version : V1.0
 */
public class TestMain {
    public static void main(String[] args) {
        Builder<GirlFriend> entiy = Builder.of(GirlFriend::new)
                .with(GirlFriend::setAddress, "")
                .with(GirlFriend::addGift, "情人节礼物", "LBR 1912女王时代")
                .with(GirlFriend::addGift, "生日礼物", "迪奥烈焰蓝金");


    }
}