Java List集合根据某字段去重

去重方法

单个字段为条件去重

/**
     * 单字段去重
     * @param jackpotList1 新集合
     * @param jackpotList 需要去重的集合
     * @return
     */
    private List<Jackpot> distinctList1(List<Jackpot> jackpotList1, List<Jackpot> jackpotList) {
        jackpotList1.addAll(jackpotList);
        return jackpotList1.stream().collect(
                Collectors.collectingAndThen(
                        Collectors.toCollection(() -> new TreeSet<>(Comparator.comparing(Jackpot::getPrizeId))),ArrayList::new
                )
        );
    }

多个字段为条件去重

/**
     * 多字段去重
     * @param jackpotList1 新集合
     * @param jackpotList 需要去重的集合
     * @return
     */
    private List<Jackpot> distinctList(List<Jackpot> jackpotList1, List<Jackpot> jackpotList) {
        jackpotList1.addAll(jackpotList);
        return jackpotList1.stream().collect(
                Collectors.collectingAndThen(
                        Collectors.toCollection(() -> new TreeSet<>(Comparator.comparing(jackpot -> jackpot.getMyOrderId() + ";" + jackpot.getPrizeId()))),ArrayList::new
                )
        );
    }

标签：jackpotList,jackpotList1,return,某字,List,param,new,Java
来源： https://www.cnblogs.com/aerfazhe/p/15710314.html