Java para ordenación compleja (comparador personalizado)

Java para ordenación compleja (comparador personalizado)

Para completar una clasificación más compleja de una Lista de Java, se utiliza un Comparador personalizado Aquí hay un registro del proceso de uso.

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;
}

resultado

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}]

Comparador personalizado

/**
 * @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;
    }
}