4p1.txt

public class Part1 {

    private static int valid = 0;
    public static void main(String[] args) {
        try (Stream<String> stream = Files.lines(Paths.get("E:\\AdventOfCode\\Day 4\\input.txt"))) {
            stream.forEach(string -> {
                if (isValid(string)) {
                    valid++;
                    System.out.println("Valid: " + string);
                } else {
                    System.out.println("Invalid: " + string);
                }
            });
        } catch (IOException e) {
            e.printStackTrace();
        }

        System.out.println("Result:\n   " + valid);
    }

    private static boolean isValid(String word) {
        List<String> parts = new ArrayList<>();
        for (String part : word.split(" ")) {
            if (!parts.contains(part)) {
                parts.add(part);
            } else {
                return false;
            }
        }
        return true;
    }
}