checking palindrome string in java

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 static boolean isPalindrome(String str){ StringBuilder sb=new StringBuilder(str); sb.reverse(); String rev=sb.toString(); if(str.equals(rev)){ return true; }else{ return false; } }

public static boolean checkPalindrome(String str) { int len = str.length(); for(int i = 0; i < len / 2; i++) { if (str.charAt(i) != str.charAt(len - i - 1)) return false; } return true; }

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)); }

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