package com.chen.api.util;

import java.util.ArrayList;

import java.util.List;

/**

* @author : chen weijie

* @Date: 2019-05-08 16:54

*/

public class SplitList {

public static <T> List<List<T>> partList(List<T> source, int n) {

if (source == null) {

return null;

}

if (n == 0) {

return null;

}

List<List<T>> result = new ArrayList<List<T>>();

// 集合长度

int size = source.size();

// 余数

int remaider = size % n;

System.out.println("余数:" + remaider);

// 商

int number = size / n;

System.out.println("商:" + number);

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

List<T> value = source.subList(i * n, (i + 1) * n);

result.add(value);

}

if (remaider > 0) {

List<T> subList = source.subList(size - remaider, size);

result.add(subList);

}

return result;

}

/**

* 将待邀请的成员列表分成n个组

*

* @param source

* @param n

* @return

*/

private <T>List<List<T>> splitList(List<T> source, int n) {

List<List<T>> result = new ArrayList<>();

//(先计算出余数)

int remaider = source.size() % n;

//然后是商

int number = source.size() / n;

//偏移量

int offset = 0;

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

List<T> value;

if (remaider > 0) {

value = source.subList(i * number + offset, (i + 1) * number + offset + 1);

remaider--;

offset++;

} else {

value = source.subList(i * number + offset, (i + 1) * number + offset);

}

result.add(value);

}

return result;

}

}