35 lines
1.0 KiB
Java
35 lines
1.0 KiB
Java
package strings;
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/**
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* <p>
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* Alphabetical order is a system whereby character strings are placed in order
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* based on the position of the characters in the conventional ordering of an alphabet.
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* </p>
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* Wikipedia: https://en.wikipedia.org/wiki/Alphabetical_order
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*/
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class Alphabetical {
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public static void main(String[] args) {
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assert !isAlphabetical("123abc");
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assert isAlphabetical("aBC");
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assert isAlphabetical("abc");
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assert !isAlphabetical("xyzabc");
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assert isAlphabetical("abcxyz");
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}
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/**
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* Check if a string is alphabetical order or not
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*
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* @param s a string
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* @return {@code true} if given string is alphabetical order, otherwise {@code false}
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*/
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public static boolean isAlphabetical(String s) {
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s = s.toLowerCase();
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for (int i = 0; i < s.length() - 1; ++i) {
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if (!Character.isLetter(s.charAt(i)) || !(s.charAt(i) <= s.charAt(i + 1))) {
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return false;
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}
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}
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return true;
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}
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} |