Java中List数据去重的3种有效方法总结

public static List<String> delRepeat(List<String> list) {
    return list.stream()
               .distinct()
               .collect(Collectors.toList());
}

/**
 * 去除重复数据
 * 注意：Set 是无序的，不会保持原有顺序
 */
public static List<String> listDistinct(List<String> list) {
    List<String> result = new ArrayList<>();
    if (list != null && !list.isEmpty()) {
        Set<String> set = new HashSet<>(list);
        result.addAll(set);
    }
    return result;
}

public static List<String> delRepeat(List<String> list) {
    List<String> listNew = new ArrayList<>();
    for (String str : list) {
        if (!listNew.contains(str)) {
            listNew.add(str);
        }
    }
    return listNew;
}

List<String> listNew = new ArrayList<>(new TreeSet<>(list));

List<String> listNew = new ArrayList<>(new LinkedHashSet<>(list));

/**
 * 去除重复数据（一般不推荐）
 * 类似于冒泡排序思想
 */
public static List<Map<String, Object>> distinct(List<Map<String, Object>> list) {
    if (list != null && list.size() > 0) {
        for (int i = 0; i < list.size() - 1; i++) {
            for (int j = list.size() - 1; j > i; j--) {
                // 根据实际业务修改比较规则
                if (list.get(j).equals(list.get(i))) {
                    list.remove(j);
                }
            }
        }
    }
    return list;
}