1. 按指定大小，分隔集合，将集合按规定个数分为n个部分

public static List<List<T>> splitList(List<T> list, int len) {  
	if (list == null || list.size() == 0 || len < 1) {  
		return null;  
	}  
  
	List<List<T>> result = new ArrayList<List<T>>();  
  
  
	int size = list.size();  
	int count = (size + len - 1) / len;  
  
  
	for (int i = 0; i < count; i++) {  
		List<T> subList = list.subList(i * len, ((i + 1) * len > size ? size : len * (i + 1)));  
		result.add(subList);  
	}  
	return result;  
}  

2.将一个list均分成n个list

	public static <T> List<List<T>> averageAssign(List<T> list,int n){
		List<List<T>> result=new ArrayList<List<T>>();
		int remaider=list.size()%n;  //(先计算出余数)
		int number=list.size()/n;  //然后是商
		int offset=0;//偏移量
		for(int i=0;i<n;i++){
			List<T> value=null;
			if(remaider>0){
				value=list.subList(i*number+offset, (i+1)*number+offset+1);
				remaider--;
				offset++;
			}else{
				value=list.subList(i*number+offset, (i+1)*number+offset);
			}
			result.add(value);
		}
		return result;
	}