java 区间分为5等分_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

*

* @param source 要分组的数据源

* @param n 平均分成n组

* @param

* @return

*/

public static List> averageAssign(List source, int n) {

List> result = new ArrayList>();

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 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

* @param source 要分组的数据源

* @param n 每组n个元素

* @param

* @return

*/

public static List> fixedGrouping(List source, int n) {

if (null == source || source.size() == 0 || n <= 0)

return null;

List> result = new ArrayList>();

int sourceSize = source.size();

int size = (source.size() / n) + 1;

for (int i = 0; i < size; i++) {

List subset = new ArrayList();

for (int j = i * n; j < (i + 1) * n; j++) {

if (j < sourceSize) {

subset.add(source.get(j));

}

}

result.add(subset);

}

return result;

}

/**

* 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

* @return

*/

public static List> fixedGrouping2(List source, int n) {

if (null == source || source.size() == 0 || n <= 0)

return null;

List> result = new ArrayList>();

int remainder = source.size() % n;

int size = (source.size() / n);

for (int i = 0; i < size; i++) {

List subset = null;

subset = source.subList(i * n, (i + 1) * n);

result.add(subset);

}

if (remainder > 0) {

List subset = null;

subset = source.subList(size * n, size * n + remainder);

result.add(subset);

}

return result;

}

标签：分成,subset,JAVA,int,List,source,result,size

来源： https://www.cnblogs.com/fangts/p/13750562.html