List
     
       beforeList= new ArrayList<>();        for (int i = 0; i < 100 ; i++) {            beforeList.add(i);        }        //假如有一个list，元素个数100        int current=1; //页码        int pageSize=10; //每页显示的数量        int totalCount=beforeList.size();        int pageCount = (totalCount / pageSize) + ((totalCount % current > 0) ? 1 : 0);        int start=(current-1) * pageSize;        int end = current==pageCount ? totalCount : current * pageSize;        List
      
        updateList=beforeList.subList(start,end);        System.out.println(updateList);