LIST集合固定分组，没组N个元素方法

/**
 * 将一组数据固定分组，每组n个元素
 *
 * @param source 要分组的数据源
 * @param n      每组n个元素
 * @param <T>
 * @return
 */
public <T> List<List<T>> fixedGrouping(List<T> source, int n) {

    if (null == source || source.size() == 0 || n <= 0) {
        return null;
    }
    List<List<T>> result = new ArrayList<List<T>>();
    int remainder = source.size() % n;
    int size = (source.size() / n);
    for (int i = 0; i < size; i++) {
        List<T> subset = null;
        subset = source.subList(i * n, (i + 1) * n);
        result.add(subset);
    }
    if (remainder > 0) {
        List<T> subset = null;
        subset = source.subList(size * n, size * n + remainder);
        result.add(subset);
    }
    return result;
}