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String name;

void checkName(String name) throws IllegalArgumentException {
	// no name can be less than two characters
	if (name.length < 2) {
		throw new IllegalArgumentException("The name is too short, it must be at least two characters");
	}
	// a name can only contain letters, spaces and hyphens
	for (int i = 0; i < name.length(); i++) {
		char c = name.charAt(i);
		if (! (Character.isLetter(c) || c == ' ' || c == '-')) {
			throw new IllegalArgumentException("'" + c + "' is an illegal character, a name can only contain letters, space or hyphens");
		}
	}
}

void setName(String name) {
	checkName(name);
	this.name = name;
}

 classclass Person {
	String name
	void checkName(String) throws IllegalArgumentException
	void setName(String)
}