strings.java

//    	Know if word is palindrome
//    	System.out.println((isPalindrome(palindrome) ? "Yes" : "No")); -> Output "Yes"
public static boolean isPalindrome(String s) {
		String word = new StringBuilder(s).reverse().toString();
		return word.equalsIgnoreCase(s);
}

//    	Know number of characters contains this word
//	String word = "Palangana";
//	char character = 'a';
//	int number = characterOcurrence("Palangana", 'a');
//	System.out.println("In the word: '"+word+"' are " + number + " '" + character + "'"); -> In the word: palangana are 4 a
public static int characterOcurrence(String s, char character) {
		s = s.replaceAll("[^"+ character + "]","");
		System.out.println(s);
		return s.length();
}