public int getID() {
		int root = (int) Math.pow(10, ID_LEN);
		int id = 0;
		do {
			long tmp = Math.abs(Double.doubleToLongBits(Math.random()));
			id = (int) (tmp % root);
		} while (id < (root / 10));
		// System.out.println(id);
		return id;
	}