Method min

java/Chapter 17/Question17_14/Result.java:15–23

(Result r1, Result r2)

	}
	
	public static Result min(Result r1, Result r2) {
		if (r1 == null) {
			return r2;
		} else if (r2 == null) {
			return r1;
		} 
		
		return r2.invalid < r1.invalid ? r2 : r1;
	}	
}