Answer:
// program in java.
// library
import java.util.*;
// class definition
class Main
{
// recursive function to check palindrome
public static boolean isPalin(String str){
// base case
if(str.length() == 0 ||str.length()==1){
return true;
}
// if first character is equal to last
if(str.charAt(0) == str.charAt(str.length()-1))
{
// recursive call
return isPalin(str.substring(1, str.length()-1));
}
// return
return false;
}
// main method of the class
public static void main (String[] args) throws java.lang.Exception
{
try{
// object to read input
Scanner scr=new Scanner(System.in);
System.out.print("Enter a string:");
// read string from user
String myString =scr.nextLine();
// call function to check palindrome
if (isPalin(myString)){
System.out.println("Given String is a palindrome");
}
// if string is not palindrome
else{
System.out.println("Given String is not a palindrome");
}
}catch(Exception ex){
return;}
}
}
Explanation:
Read a string from user and assign it to variable "myString" with scanner object. Call the method isPalindrome() with string input parameter.In this method, if length of string is 0 or 1 then it will return true(base case) otherwise it will call itself and compare first character with last character.If string is palindrome then function will return true else return false.
Output:
Enter a string:ababa
Given String is a palindrome
