java list转二维数组

   /*
    * 转为二维数组
    * */

    private String[][] changeList( List list,Integer row){
        Integer Row = row==null||row<1?20:row;
//            System.out.println(ye);
        int listLength = list.size();
        int yuShu = listLength%Row;
        int ye = (yuShu==0)?(int)Math.ceil(listLength/Row):((int)Math.ceil(listLength/Row)+1);
        String[][] arrList = new String[ye][];
        for(int i=0;i<ye;i++){
            if(ye==1){
                arrList[i] =  (String[])list.subList(0,listLength).toArray(new String[listLength]);
            }else{
                if(i==ye-1){
                    arrList[i] = (String[])list.subList(i*Row,listLength).toArray(new String[listLength-i*Row]);
                }else{
                    arrList[i] = (String[])list.subList(i*Row,(i+1)*Row).toArray(new String[Row]);
                }
            }
        }
        return arrList;
    }