JavaAlgorithms/strings/Alphabetical.java at main · sarvex/JavaAlgorithms · GitHub

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package strings;

/**

* Alphabetical order is a system whereby character strings are placed in order based on the

* position of the characters in the conventional ordering of an alphabet. Wikipedia:

* https://en.wikipedia.org/wiki/Alphabetical_order

class Alphabetical {

public static void main(String[] args) {

assert !isAlphabetical("123abc");

assert isAlphabetical("aBC");

assert isAlphabetical("abc");

assert !isAlphabetical("xyzabc");

assert isAlphabetical("abcxyz");

}

/**

* Check if a string is alphabetical order or not

* @param s a string

* @return {@code true} if given string is alphabetical order, otherwise {@code false}

public static boolean isAlphabetical(String s) {

s = s.toLowerCase();

for (int i = 0; i < s.length() - 1; ++i) {

if (!Character.isLetter(s.charAt(i)) || !(s.charAt(i) <= s.charAt(i + 1))) {

return false;

}

return true;

}

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