BasicStringUtils.java

package com.dtcc.exams.fundamentals;

public class BasicStringUtils {
    /**
     * @param string1 - Base string to be added to
     * @param string2 - String to add to `string1`
     * @return concatenation of `string1` and `string2`
     */
    public static String concatentate(String string1, String string2) {return string1+string2;}

    /**
     * @param string1 - String to be reversed
     * @return an identical string with characters in reverse order
     */
    public static String reverse(String string1) {
        String temp = "";
        for(int i = string1.length()-1; i >= 0; i--){
            temp += string1.charAt(i) + "";
        }
        return temp;
    }

    /**
     * @param string1 - first string to be reversed
     * @param string2 - second string to be reversed
     * @return concatenation of the reverse of `string1` and reverse of `string2`
     */
    public static String reverseThenConcatenate(String string1, String string2) {
        return reverse(string1) + reverse(string2);
    }

    /**
     * @param string - the string to be manipulated
     * @param charactersToRemove - Characters that should be removed from `string`
     * @return `string` with `charactersToRemove` removed
     */
    public static String removeCharacters(String string, String charactersToRemove) {
        String temp = string.replaceAll("[" + charactersToRemove +"]", "");
        return temp;
    }

    /**
     * @param string - the string to be manipulated
     * @param charactersToRemove - characters to be removed from the string
     * @return reverse of `string` with `charactersToRemove` removed
     */
    public static String removeCharactersThenReverse(String string, String charactersToRemove) {
        return reverse(removeCharacters(string, charactersToRemove));
    }
}