JAVA实现数据等分，一个List分成多个List

JAVA实现数据等分，一个List分成多个List

• 将一组数据平均分成n组

/*** 将一组数据平均分成n组** @param source 要分组的数据源* @param n      平均分成n组* @param <T>* @return*/
public static <T> List<List<T>> averageAssign(List<T> source, int n) {List<List<T>> result = new ArrayList<List<T>>();int remainder = source.size() % n;  //(先计算出余数)int number = source.size() / n;  //然后是商int offset = 0;//偏移量for (int i = 0; i < n; i++) {List<T> value = null;if (remainder > 0) {value = source.subList(i * number + offset, (i + 1) * number + offset + 1);remainder--;offset++;} else {value = source.subList(i * number + offset, (i + 1) * number + offset);}result.add(value);}return result;
}

•  将一组数据固定分组，每组n个元素

/*** 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 static <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 sourceSize = source.size();int size = (source.size() / n) + 1;for (int i = 0; i < size; i++) {List<T> subset = new ArrayList<T>();for (int j = i * n; j < (i + 1) * n; j++) {if (j < sourceSize) {subset.(j));}}result.add(subset);}return result;
}

• 将一组数据固定分组，每组n个元素

/*** 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 static <T> List<List<T>> fixedGrouping2(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;
}