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GeezerVison is showing github.com — Java/strings/Palindrome.java at master · ppdouble/Java

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Palindrome.java

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package strings;
/** Wikipedia: https://en.wikipedia.org/wiki/Palindrome */
class Palindrome {
/** Driver Code */
public static void main(String[] args) {
String[] palindromes = {null, "", "aba", "123321"};
for (String s : palindromes) {
assert isPalindrome(s) && isPalindromeRecursion(s) && isPalindrome1(s);
}
String[] notPalindromes = {"abb", "abc", "abc123"};
for (String s : notPalindromes) {
assert !isPalindrome(s) && !isPalindromeRecursion(s) && !isPalindrome1(s);
}
}
/**
* Check if a string is palindrome string or not
*
* @param s a string to check
* @return {@code true} if given string is palindrome, otherwise {@code false}
*/
public static boolean isPalindrome(String s) {
return (s == null || s.length() <= 1) || s.equals(new StringBuilder(s).reverse().toString());
}
/**
* Check if a string is palindrome string or not using recursion
*
* @param s a string to check
* @return {@code true} if given string is palindrome, otherwise {@code false}
*/
public static boolean isPalindromeRecursion(String s) {
if (s == null || s.length() <= 1) {
return true;
}
if (s.charAt(0) != s.charAt(s.length() - 1)) {
return false;
}
return isPalindrome(s.substring(1, s.length() - 1));
}
/**
* Check if a string is palindrome string or not another way
*
* @param s a string to check
* @return {@code true} if given string is palindrome, otherwise {@code false}
*/
public static boolean isPalindrome1(String s) {
if (s == null || s.length() <= 1) {
return true;
}
for (int i = 0, j = s.length() - 1; i < j; ++i, --j) {
if (s.charAt(i) != s.charAt(j)) {
return false;
}
}
return true;
}
}
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