Java for complex sorting (custom Comparator)

Java for complex sorting (custom Comparator)

In completing a more complex sorting of a Java List, a custom Comparator is used. Here is a record of the process of use.

public static void main(String[] args) {
    
    
    List<CardVo> vos = new ArrayList<>();
    vos.add(CardVo.builder().batchType(TicketBatchTypeEnum.TONG_TICKET).expiredTime(LocalDateTime.of(2021, 3, 31, 0, 0, 0)).faceValue(BigDecimal.valueOf(50)).build());
    vos.add(CardVo.builder().batchType(TicketBatchTypeEnum.TONG_TICKET).expiredTime(LocalDateTime.of(2021, 3, 30, 0, 0, 0)).faceValue(BigDecimal.valueOf(40)).build());
    vos.add(CardVo.builder().batchType(TicketBatchTypeEnum.TONG_TICKET).expiredTime(LocalDateTime.of(2021, 3, 29, 0, 0, 0)).faceValue(BigDecimal.valueOf(30)).build());
    vos.add(CardVo.builder().batchType(TicketBatchTypeEnum.TONG_TICKET).expiredTime(LocalDateTime.of(2021, 3, 27, 0, 0, 0)).faceValue(BigDecimal.valueOf(20)).build());
    vos.add(CardVo.builder().batchType(TicketBatchTypeEnum.TONG_TICKET).expiredTime(LocalDateTime.of(2021, 3, 27, 0, 0, 0)).faceValue(BigDecimal.valueOf(10)).build());
    vos.add(CardVo.builder().batchType(TicketBatchTypeEnum.PRICE_TICKET).expiredTime(LocalDateTime.of(2021, 3, 31, 0, 0, 0)).faceValue(BigDecimal.valueOf(50)).build());
    vos.add(CardVo.builder().batchType(TicketBatchTypeEnum.PRICE_TICKET).expiredTime(LocalDateTime.of(2021, 3, 30, 0, 0, 0)).faceValue(BigDecimal.valueOf(40)).build());
    vos.add(CardVo.builder().batchType(TicketBatchTypeEnum.PRICE_TICKET).expiredTime(LocalDateTime.of(2021, 3, 29, 0, 0, 0)).faceValue(BigDecimal.valueOf(30)).build());
    vos.add(CardVo.builder().batchType(TicketBatchTypeEnum.PRICE_TICKET).expiredTime(LocalDateTime.of(2021, 3, 27, 0, 0, 0)).faceValue(BigDecimal.valueOf(20)).build());
    vos.add(CardVo.builder().batchType(TicketBatchTypeEnum.PRICE_TICKET).expiredTime(LocalDateTime.of(2021, 3, 27, 0, 0, 0)).faceValue(BigDecimal.valueOf(10)).build());

    // 排序前的list
    String s = JSONObject.toJSONString(vos);
    System.out.println(s);
    // 排序后的list
    List<CardVo> cardVoComparator = orderBy(vos);
    s = JSONObject.toJSONString(cardVoComparator);
    System.out.println(s);
}


/**
 * 排序方法
 *
 * @param cardVos 排序前的List
 * @return 排序后的List
 */
private static List<CardVo> orderBy(List<CardVo> cardVos) {
    
    
    ComparatorCardVo comparatorCardVo = new ComparatorCardVo();
    cardVos = cardVos.stream().sorted(comparatorCardVo).collect(Collectors.toList());
    return cardVos;
}

result

排序前的:
[{"batchType":"TONG_TICKET","expiredTime":"2021-03-31T00:00:00","faceValue":50},{"batchType":"TONG_TICKET","expiredTime":"2021-03-30T00:00:00","faceValue":40},{"batchType":"TONG_TICKET","expiredTime":"2021-03-29T00:00:00","faceValue":30},{"batchType":"TONG_TICKET","expiredTime":"2021-03-27T00:00:00","faceValue":20},{"batchType":"TONG_TICKET","expiredTime":"2021-03-27T00:00:00","faceValue":10},{"batchType":"PRICE_TICKET","expiredTime":"2021-03-31T00:00:00","faceValue":50},{"batchType":"PRICE_TICKET","expiredTime":"2021-03-30T00:00:00","faceValue":40},{"batchType":"PRICE_TICKET","expiredTime":"2021-03-29T00:00:00","faceValue":30},{"batchType":"PRICE_TICKET","expiredTime":"2021-03-27T00:00:00","faceValue":20},{"batchType":"PRICE_TICKET","expiredTime":"2021-03-27T00:00:00","faceValue":10}]
排序后的:
[{"batchType":"TONG_TICKET","expiredTime":"2021-03-27T00:00:00","faceValue":20},{"batchType":"TONG_TICKET","expiredTime":"2021-03-27T00:00:00","faceValue":10},{"batchType":"TONG_TICKET","expiredTime":"2021-03-29T00:00:00","faceValue":30},{"batchType":"TONG_TICKET","expiredTime":"2021-03-30T00:00:00","faceValue":40},{"batchType":"TONG_TICKET","expiredTime":"2021-03-31T00:00:00","faceValue":50},{"batchType":"PRICE_TICKET","expiredTime":"2021-03-27T00:00:00","faceValue":20},{"batchType":"PRICE_TICKET","expiredTime":"2021-03-27T00:00:00","faceValue":10},{"batchType":"PRICE_TICKET","expiredTime":"2021-03-29T00:00:00","faceValue":30},{"batchType":"PRICE_TICKET","expiredTime":"2021-03-30T00:00:00","faceValue":40},{"batchType":"PRICE_TICKET","expiredTime":"2021-03-31T00:00:00","faceValue":50}]

Custom Comparator

/**
 * @Description: <br/>
 * 优化券排序
 * <p>
 * <br/>
 * @Author: zhangqi
 * @create 2021/3/26 12:59
 */
@NoArgsConstructor
public class ComparatorCardVo implements Comparator<CardVo> {
    
    

    /**
     * 优化券排序规则
     *
     * @param o1 参数1
     * @param o2 参数2
     * @return 比较结果
     */
    @Override
    public int compare(CardVo o1, CardVo o2) {
    
    
        // 比较券类型  通兑券在上
        TicketBatchTypeEnum batchType1 = o1.getBatchType();
        TicketBatchTypeEnum batchType2 = o2.getBatchType();
        // 券类型不相同   通兑券在上
        if (!Objects.equals(batchType1, batchType2)) {
    
    
            return !Objects.equals(batchType1, TicketBatchTypeEnum.TONG_TICKET) ? 1 : -1;
        }
        // 比较券时间  时间小的在上
        LocalDateTime expiredTime1 = o1.getExpiredTime();
        LocalDateTime expiredTime2 = o2.getExpiredTime();
        // 卷类型相同  时间小的在上
        if (!Objects.equals(expiredTime1, expiredTime2)) {
    
    
            return expiredTime1.compareTo(expiredTime2) < 0 ? -1 : 1;
        }
        // 比较金额  
        BigDecimal faceValue1 = o1.getFaceValue();
        BigDecimal faceValue2 = o2.getFaceValue();
        // 卷类型相同 券时间相同  金额大的在上
        if (!BigDecimalUtil.compare(faceValue1, CompareEnum.EQ, faceValue2)) {
    
    
            return BigDecimalUtil.compare(faceValue1, CompareEnum.GT, faceValue2) ? -1 : 1;
        }
        return 0;
    }
}