private boolean addRentDate(String name,long ID) {
		for (DVDUser a : this.userDVDArrayList) {
			if (name.equals(a.getName())) {
				// ҵ
				++a.rentAmount;
				return false;
			}
		}
		// δҵ
		this.userDVDArrayList.add(new DVDUser(name,ID,1,0));
		return true;
	}