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 distinctList1(List jackpotList1, List 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 distinctList(List jackpotList1, List jackpotList) {
        jackpotList1.addAll(jackpotList);
        return jackpotList1.stream().collect(
                Collectors.collectingAndThen(
                        Collectors.toCollection(() -> new TreeSet<>(Comparator.comparing(jackpot -> jackpot.getMyOrderId() + ";" + jackpot.getPrizeId()))),ArrayList::new
                )
        );
    }