說明

有兩個(gè)list,分別是newList 和 oldList，快速取出兩個(gè) newList 中某個(gè)屬性值相同的實(shí)體和不同的實(shí)體文章來源地址http://www.zghlxwxcb.cn/news/detail-719238.html

代碼

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);

        //過濾出需要插入的數(shù)據(jù)，這里就是過濾多個(gè)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中就是需要插入的數(shù)據(jù)
        System.out.println("newList中 couponNum 不相同的數(shù)據(jù) = " + collectOne);

        //過濾出需要插入的數(shù)據(jù)，這里就是過濾多個(gè)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中就是需要插入的數(shù)據(jù)
        System.out.println("newList中 couponNum 相同的數(shù)據(jù) = " + collectTwo);
        
    }
}

@ToString
@Data
class Segment {
    /** Coupon號 */
    private String couponNum;
    /** 起飛機(jī)場編碼 */
    private String depAirportCode;
    /** 降落機(jī)場編碼 */
    private String arrAirportCode;
}

運(yùn)行結(jié)果

newList中 couponNum 不相同的數(shù)據(jù) = [
Segment(couponNum=3, depAirportCode=山西2, arrAirportCode=北京2)
]

newList中 couponNum 相同的數(shù)據(jù) = [
Segment(couponNum=1, depAirportCode=山西, arrAirportCode=北京), 
Segment(couponNum=2, depAirportCode=山西2, arrAirportCode=北京2)
]

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