_2047.java

package com.fishercoder.solutions;

public class _2047 {
    public static class Solution1 {
        public int countValidWords(String sentence) {
            String[] tokens = sentence.split("\\s+");
            int count = 0;
            for (String token : tokens) {
                int hyphenCount = 0;
                int punctuationMarkCount = 0;
                boolean valid = true;
                if (token.isEmpty() || token.equals("") || token.length() == 0) {
                    continue;
                }
                for (int i = 0; i < token.length(); i++) {
                    if (token.charAt(i) == '-') {
                        hyphenCount++;
                        if (hyphenCount > 1 || i == 0 || i == token.length() - 1 || !Character.isAlphabetic(token.charAt(i - 1)) || !Character.isAlphabetic(token.charAt(i + 1))) {
                            valid = false;
                            break;
                        }
                    } else if (token.charAt(i) == '!' || token.charAt(i) == '.' || token.charAt(i) == ',') {
                        punctuationMarkCount++;
                        if (punctuationMarkCount > 1 || i != token.length() - 1) {
                            valid = false;
                            break;
                        }
                    } else if (Character.isDigit(token.charAt(i))) {
                        valid = false;
                        break;
                    } else if (Character.isDigit(token.charAt(i))) {
                        valid = false;
                        break;
                    }
                }
                if (valid) {
                    count++;
                }
            }
            return count;
        }
    }
}