public class StringUtility {
public static String reverse(String sentence) {
String[] words = sentence.replaceAll(" +", " ").toLowerCase().split(" ");
String s = "";
for (int i = words.length - 1; i >= 0 ; i--) {
s += words[i] + " ";
}
return s;
}
public static char maxOccuringCharacter(String sentence) throws IllegalArgumentException {
char[] characters = sentence.replaceAll("[^a-zA-Z0-9]","").toLowerCase().toCharArray();
int[] cells = new int[256];
char result = ' ';
int max = -1;
try {
for (int i = 0; i < characters.length - 1; i++)
for (int j = 0; j < characters.length - 1; j++)
if (characters[i] == characters[j])
cells[characters[i]]++;
for (int i = 0; i < characters.length - 1; i++) {
if (cells[characters[i]] > max) {
max = cells[characters[i]];
result = characters[i];
}
}
} catch (Exception e) {
}
return result;
}
public static boolean isPalindrome(String input) {
return input.equals((new StringBuilder(input)).reverse().toString());
}
}
public class Test {
public static void main(String[] args) {
System.out.println(StringUtility.reverse("This is a SENTENCE"));
System.out.println(StringUtility.reverse("This SENTENCE"));
System.out.println(StringUtility.maxOccuringCharacter("iiiiiii"));
System.out.println(StringUtility.maxOccuringCharacter("IiijjjJJ"));
System.out.println(StringUtility.isPalindrome("madam"));
System.out.println(StringUtility.isPalindrome("racecar"));
System.out.println(StringUtility.isPalindrome("egdhsghfsdbfjkdnbsgal"));
System.out.println(StringUtility.isPalindrome("lol"));
}
}