public static boolean isPlate(String plate) {

		if (plate.length() == 7) {
			char[] charPlate = plate.toCharArray();

			for (int i = 0; i < charPlate.length; i++) {
				if (i < 3) {
					if (!Character.isLetter(charPlate[i])) {
						return false;
					}
				} else {
					if (i == 3) {
						if (charPlate[i] != '-') {
							return false;
						}
					} else {
						if (!Character.isDigit(charPlate[i])) {
							return false;
						}
					}
				}
			}
		} else {
			return false;
		}

		return true;
	}