判断一个日期字符串是否输入正确

import java.text.ParseException;
import java.text.SimpleDateFormat;

public class ValidateDate {

	public static void main(String[] args) throws ParseException {

		String inputDate = "2009-13-32";
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
		if (inputDate.equals(sdf.format(sdf.parse(inputDate)))) {
			System.out.println("ok");
		} else {
			System.out.println("error");
		}
	}

}