src/main/java/com/mavlushechka/a1qa/utils/StringUtils.java


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package com.mavlushechka.a1qa.utils;

import java.util.Random;

public class StringUtils {

    private StringUtils() {
    }

    public static String convertToConstantCase(String text) {
        StringBuilder stringBuilder = new StringBuilder();
        String[] words = text.split(" ");

        for (int i = 0; i < words.length; i++) {
            stringBuilder.append(words[i].toUpperCase());
            if (i != words.length-1) {
                stringBuilder.append("_");
            }
        }

        return stringBuilder.toString();
    }

    public static String capitalizeFirstLetter(String text) {
        return text.substring(0, 1).toUpperCase() + text.substring(1);
    }

    public static int removeNonDigits(String text) {
        return Integer.parseInt(text.replaceAll("[^0-9]+", ""));
    }

    public static String generateRandomText(int lettersLowerBound, int lettersUpperBound, int length) {
        return new Random().ints(lettersLowerBound, lettersUpperBound + 1)
                .limit(length)
                .collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append)
                .toString();
    }

    public static String replaceByStars(String text) {
        return "*".repeat(text.length());
    }

}