Word & Character Counter — Java source

// word-counter — Java port: word / character / sentence / paragraph counts + 200-wpm reading-time estimate.
//
// Display snippet: ports the counters from the TypeScript lib (src/lib/wordCount.ts). Java strings
// are UTF-16, so String.length() is the same unit the TS reference counts. Requires Java 11+
// (strip / isBlank mirror the JS Unicode-aware trim and blank checks).
import java.util.Arrays;
import java.util.regex.Pattern;

public final class WordCounter {
    private static final Pattern SENTENCE = Pattern.compile("[^.!?]+[.!?]+");

    // Words: split on whitespace runs after stripping — blank input -> 0.
    public static long countWords(String t) {
        String s = t.strip();
        return s.isEmpty() ? 0 : s.split("\\s+").length;
    }

    // Total character count, whitespace included.
    public static int countChars(String t) {
        return t.length();
    }

    // Character count with all whitespace removed.
    public static long countCharsNoSpaces(String t) {
        return t.chars().filter(c -> !Character.isWhitespace(c)).count();
    }

    // Sentences: maximal runs of non-terminators each closed by one or more
    // of . ! ? — the TS regex /[^.!?]+[.!?]+/g.
    public static int countSentences(String t) {
        return SENTENCE.matcher(t).results().mapToInt(m -> 1).sum();
    }

    // Paragraphs separated by one or more blank lines; blank segments don't count.
    public static long countParagraphs(String t) {
        return Arrays.stream(t.split("\\n{2,}")).filter(s -> !s.isBlank()).count();
    }

    // Reading time at 200 wpm: 0 for empty input, otherwise >= 1 minute.
    // (words + 100) / 200 reproduces Math.round(words / 200.0).
    public static long readingTimeMin(long words) {
        if (words <= 0) return 0;
        return Math.max(1, (words + 100) / 200);
    }

    public static void main(String[] args) {
        String text = "CosmoDev counts words. Live totals update as you type!\n\n"
                + "Second paragraph? Two sentences - each with words. Zero logins needed.";
        System.out.println("words:       " + countWords(text));         // 20
        System.out.println("chars:       " + countChars(text));         // 126
        System.out.println("no spaces:   " + countCharsNoSpaces(text)); // 106
        System.out.println("sentences:   " + countSentences(text));     // 5
        System.out.println("paragraphs:  " + countParagraphs(text));    // 2
        System.out.println("reading min: " + readingTimeMin(countWords(text))); // 1
    }
}