Java List 分页

//分页，根据country或者site分@Override
br/>@Override
List<Integer> subFrames = getSites(parentLevel) ;
int currentNum = ( currentPage - 1 ) * CardViewUtil.PREPAGE_NUM ;
Double val = (double) (subFrames.size()/ CardViewUtil.PREPAGE_NUM) ;
int pageNum = (int) Math.ceil(val) ;
if( subFrames.size() > 0 && currentPage > 0 && currentPage <= pageNum){
int nextPageSize = CardViewUtil.PREPAGE_NUM > ( subFrames.size() - currentNum ) ? ( subFrames.size() - currentNum ) : CardViewUtil.PREPAGE_NUM ;
subFrames = subFrames.subList( currentNum , (currentNum + nextPageSize)) ;
}else{
subFrames.clear();
}
return subFrames ;
}