Java之list分割

public  List> averageAssign2(List source, int splitNum){

        List> result = new ArrayList>();
        //循环下标
        int i = 0;
        //集合总数 / 分割每段数
        for (; i < source.size() / splitNum; i++) {
        	//splitNum代表每段分割的子集合数据条数
            result.add(source.subList(i * splitNum, (i + 1) * splitNum));
        }
        //如果有余数，再将剩下的追加进去
        if (source.size() % splitNum != 0) {
            result.add(source.subList(i * splitNum, i * splitNum + source.size() % splitNum));
        }
        return result;
    }

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

        List> result = new ArrayList>();
        //n代表待分割的份数
        int remaider = 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(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;
    }