palindrome in java using string

Java program to check palindrome string using recursion

import java.util.Scanner;
public class RecursivePalindromeJava 
{
   // to check if string is palindrome using recursion
   public static boolean checkPalindrome(String str)
   {
      if(str.length() == 0 || str.length() == 1)
         return true; 
      if(str.charAt(0) == str.charAt(str.length() - 1))
         return checkPalindrome(str.substring(1, str.length() - 1));
      return false;
   }
   public static void main(String[]args)
   {
      Scanner sc = new Scanner(System.in);
      System.out.println("Please enter a string : ");
      String strInput = sc.nextLine();
      if(checkPalindrome(strInput))
      {
         System.out.println(strInput + " is palindrome");
      }
      else
      {
         System.out.println(strInput + " not a palindrome");
      }
      sc.close();
   }
}

Posted by: Guest on November-02-2020

Source

public class StringPalindromeJava { public static void isPalindrome(String str) { String strReverse = new StringBuffer(str).reverse().toString(); // checking for palindrome if(str.equals(strReverse)) { System.out.println(str + " is palindrome string."); } else { System.out.println(str + " is not palindrome string."); } } public static void main(String[] args) { // palindrome java isPalindrome("eye"); isPalindrome("rotator"); } }

package test //The function below checks if a string is a palindrome //True = Is a palindrome & False = Not a palindrome public boolean isPalindromString(String text){ String reverse = reverse(text); if(text.equals(reverse)) { return true; } return false; } //This function returns the reverse String of its input. //Ex. if given "hello", it will return "olleh" public String reverse(String input) { if(input == null || input.isEmpty()) { return input; } return input.charAt(input.length()- 1) + reverse(input.substring(0, input.length() - 1)); }

class Main { public static void main(String args[]) { String a, b = ""; Scanner in = new Scanner(System.in); System.out.println("Enter the string"); a = in.nextLine(); int length = a.length(); for (int i = length - 1; i >= 0; i--) b = b + a.charAt(i); if(a.equals(b)) System.out.println("The string is a palindrome."); else System.out.println("The string is not a palindrome."); } }

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