check palindrome string java code example
Example 1: Java program to check palindrome string using recursion
import java.util.Scanner;
public class RecursivePalindromeJava
{
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();
}
}
Example 2: generate palindrome java
public static String generatePalindrom(String s) {
return s.equals(reverseString(s)) ? s
: generatePalindrom(String.valueOf(Integer.parseInt(s) + Integer.parseInt(reverseString(s))));
}
public static String reverseString(String s) {
return s.length() == 1 ? s : s.charAt(s.length() - 1) + reverseString(s.substring(0, s.length() - 1));
}