Java-大集合拆分為指定大小的小集合
/**
* 拆分集合
* @param <T>
* @param resList 要拆分的集合
* @param count 每個集合的元素個數
* @return 返回拆分後的各個集合
*/
public static <T> List<List<T>> split(List<T> resList,int count){
if(resList==null ||count<1)
return null ;
List<List<T>> ret=new ArrayList<List<T>>();
int size=resList.size();
if(size<=count){ //數據量不足count指定的大小
ret.add(resList);
}else{
int pre=size/count;
int last=size%count;
//前面pre個集合，每個大小都是count個元素
for(int i=0;i<pre;i++){
List<T> itemList=new ArrayList<T>();
for(int j=0;j<count;j++){
itemList.add(resList.get(i*count+j));
}
ret.add(itemList);
}
//last的進行處理
if(last>0){
List<T> itemList=new ArrayList<T>();
for(int i=0;i<last;i++){
itemList.add(resList.get(pre*count+i));
}
ret.add(itemList);
}
}
return ret;
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
List<String> resList=Arrays.asList("0","1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26","27","28","29","30","31","32","33","34","35","36","37","38","39","40","41","42","43","44","45","46","47","48","49","50","51","52","53","54","55","56","57","58","59","60","61","62","63","64","65","66","67","68","69","70","71","72","73","74","75","76","77","78","79","80","81","82","83","84","85","86","87","88","89","90","91","92","93","94","95","96","97","98","99");
List<List<String>> ret=split(resList,10);
for(int i=0;i<ret.size();i++){
System.out.println(ret.get(i));
}
}
Java-大集合拆分為指定大小的小集合