说明

有两个list,分别是newList 和 oldList，快速取出两个 newList 中某个属性值相同的实体和不同的实体

代码

import lombok.Data;
import lombok.ToString;import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;public class Main {/**** @param args*/public static void main(String[] args) {List<Segment> newList =  new ArrayList<Segment>();Segment newO1 = new Segment();newO1.setCouponNum("1");newO1.setArrAirportCode("北京");newO1.setDepAirportCode("山西");newList.add(newO1);Segment newO12 = new Segment();newO12.setCouponNum("2");newO12.setArrAirportCode("北京2");newO12.setDepAirportCode("山西2");newList.add(newO12);Segment newO13 = new Segment();newO13.setCouponNum("3");newO13.setArrAirportCode("北京2");newO13.setDepAirportCode("山西2");newList.add(newO13);List<Segment> oldList =  new ArrayList<Segment>();Segment oldO1 = new Segment();oldO1.setCouponNum("1");oldO1.setArrAirportCode("北京");oldO1.setDepAirportCode("山西");oldList.add(newO1);Segment oldO12 = new Segment();oldO12.setCouponNum("2");oldO12.setArrAirportCode("北京2");oldO12.setDepAirportCode("山西2");oldList.add(oldO12);Segment oldO13 = new Segment();oldO13.setCouponNum("4");oldO13.setArrAirportCode("北京2");oldO13.setDepAirportCode("山西2");oldList.add(oldO13);//过滤出需要插入的数据，这里就是过滤多个不相同字段List<Segment> collectOne = newList.stream().filter(newSeg -> {for (Segment oldSeg : oldList) {if (newSeg.getCouponNum().equals(oldSeg.getCouponNum())) {return false;}}return true;}).collect(Collectors.toList());//collect中就是需要插入的数据System.out.println("newList中 couponNum 不相同的数据 = " + collectOne);//过滤出需要插入的数据，这里就是过滤多个不相同字段List<Segment> collectTwo = newList.stream().filter(newSeg -> {for (Segment oldSeg : oldList) {if (Objects.equals(newSeg.getCouponNum(),oldSeg.getCouponNum())) {return true;}}return false;}).collect(Collectors.toList());//collect中就是需要插入的数据System.out.println("newList中 couponNum 相同的数据 = " + collectTwo);}
}@ToString
@Data
class Segment {/** Coupon号 */private String couponNum;/** 起飞机场编码 */private String depAirportCode;/** 降落机场编码 */private String arrAirportCode;
}

运行结果

newList中 couponNum 不相同的数据 = [
Segment(couponNum=3, depAirportCode=山西2, arrAirportCode=北京2)
]newList中 couponNum 相同的数据 = [
Segment(couponNum=1, depAirportCode=山西, arrAirportCode=北京), 
Segment(couponNum=2, depAirportCode=山西2, arrAirportCode=北京2)
]