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
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@param source 要分组的数据源
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@param n 平均分成n组
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@param
-
@return
/
public static List<List> averageAssign(List source, int n) {
List<List> result = new ArrayList<List>();
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
/* -
将一组数据固定分组，每组n个元素
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@param source 要分组的数据源
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@param n 每组n个元素
-
@param
-
@return
*/
public static List<List> fixedGrouping(List source, int n) {扫描二维码关注公众号，回复： 5587113 查看本文章
if (null == source || source.size() == 0 || n <= 0)
return null;
List<List> result = new ArrayList<List>();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
/**
-
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<List> fixedGrouping2(List source, int n) {if (null == source || source.size() == 0 || n <= 0)
return null;
List<List> result = new ArrayList<List>();
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;
}