工具集_判断是否数字

String param = "01234567879";
		Iterator<String> iter = telephones.iterator();
		while (iter.hasNext()) {
			String phone = iter.next();
			for (int i = 0; i < phone.length(); i++) {
				if (param.indexOf(phone.charAt(i)) == -1) {
					iter.remove();
				}
			}
		}