StringUtils.java

package com.dtcc.exams.fundamentals;



public class StringUtils {
    /**
     * @param stringToBePadded - string value to be flushed right
     * @param amountOfPadding - amount of padding to be flushed left
     * @return `stringToBePadded` flushed right by left-padding
     */
    public static String padLeft(String stringToBePadded, int amountOfPadding) {

        return String.format("%" + amountOfPadding + "s", stringToBePadded);
    }

    /**
     * @param stringToBePadded - string value to be flushed left
     * @param amountOfPadding - amount of padding to be flushed right
     * @return `stringToBePadded` flushed right by right-padding
     */
    public static String padRight(String stringToBePadded, int amountOfPadding) {
        return String.format("%" + -amountOfPadding + "s", stringToBePadded);
    }

    /**
     * @param stringToBeRepeated - string value to be repeated
     * @param numberOfTimeToRepeat - number of times to repeat `stringToBeRepeated`
     * @return the string repeated and concatenated `n` times
     */
    public static String repeatString(String stringToBeRepeated, int numberOfTimeToRepeat) {
        String repeated = new String(new char[numberOfTimeToRepeat]).replace("\0", stringToBeRepeated);
        return repeated;
    }

    /**
     * @param string - string to be evaluated
     * @return - true if string only contains alpha characters
     */
    public static Boolean isAlphaString(String string) {
        string = string.replaceAll("\\s+", "");
        if(string.chars().allMatch(Character::isLetter))
        return true;
        else
            return false;
    }

    /**
     * @param string - string to be evaluated
     * @return - true if string only contains numeric characters
     */
    public static Boolean isNumericString(String string) {
        string = string.replaceAll("\\s+", "");
        if(string.chars().allMatch(Character::isDigit))
            return true;
        else
            return false;
    }

    /**
     * @param string - string to be evaluated
     * @return - true if string only contains special characters
     */
    public static Boolean isSpecialCharacterString(String string) {
        string = string.replaceAll("\\s+", "");
        if(string != null && string.chars().noneMatch(Character::isAlphabetic) && string.chars().noneMatch(Character::isDigit))
            return true;
        else
            return false;

    }
}