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ShiftCharactersAndCapitalizeVowels.java
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ShiftCharactersAndCapitalizeVowels.java
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package by.andd3dfx.string;
/**
* Implement the function: take the str parameter being passed and modify it using the following algorithm.
* Replace every letter in the string with the letter following it in the alphabet (i.e. c becomes d, z becomes a).
* Then capitalize every vowel in this new string (a, e, i, o, u) and finally return this modified string.
*
* @see <a href="https://youtu.be/Lw4gg7tkWQE">Video solution</a>
*/
public class ShiftCharactersAndCapitalizeVowels {
private static final String ALPHABET = "abcdefghijklmnopqrstuvwxyz";
private static final String VOWELS = "aeiou";
public static String apply(String str) {
char[] chars = str.toCharArray();
for (int i = 0; i < chars.length; i++) {
char c = chars[i];
int index = ALPHABET.indexOf(c);
if (index != -1) {
index = (index + 1) % ALPHABET.length();
chars[i] = capitalizeVowel(ALPHABET.charAt(index));
}
}
return new String(chars);
}
private static char capitalizeVowel(char c) {
if (VOWELS.indexOf(c) != -1) {
return Character.toUpperCase(c);
}
return c;
}
}