去重复方法小集

//js
function removeDumpicatedItem(arr){
	var ret = [];
	for(var i=0;i<arr.length;i++){
  if(ret.indexOf(arr[i]==-1)){
  	ret.push(arr[i])
  }
	}
	return ret;
}

//java(无序)
public static List removeDuplicate(List list){
	HashSet hashSet = new HashSet(list);
	list.clear();
	list.add(hashSet);
	return list;
}

//java(有序)
public static List removeDuplicate(List list){
	List ret = new ArrayList();
	for(int i=0;i<list.size();i++){
  if(!ret.contains(list.get(i))){
  	ret.add(list.get(i))
  }
	}
	return ret;
}