java分割list数据

<span style="font-size:14px;">	public ArrayList<List<String>>  getFavoriteSubList(List<String> list){
		ArrayList<List<String>> allList = new ArrayList<List<String>>();
		List<String> subList;
		int pageMax;//分页总数 
		int pageSize=20000; //每天处理数 
		int m = list.size()%pageSize;
		//求得最大分页数
		if  (m>0){
			pageMax=list.size()/pageSize+1;
		}else{
			pageMax=list.size()/pageSize;
		}
		//把大的list分割成小的list
		for(int i=1;i<=pageMax;i++){     
			if (m==0) {
				subList= list.subList((i-1)*pageSize,pageSize*(i)); 
			} else{
				if (i==pageMax) {
					subList= list.subList((i-1)*pageSize,list.size()); 
				} else {
					subList= list.subList((i-1)*pageSize,pageSize*(i));
				}
			}
			allList.add(subList);
		}
		
		Collections.reverse(allList);
		return allList;

	}</span>