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("pretty-xiaomei@qq.com"); 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"); } }
原文：https://www.cnblogs.com/pengbaowei/p/12218337.html