String Program(Convert to palindrome words)

import java.util.*;
class MakePalin
{
    public static String toPalin(String s)//to convert a word in to palindrome word and return 
    {
        String temp="";
        int len= s.length();
        for (int  i=len-1;i>=0;i--)
        {
            char ch= s.charAt(i); 
            temp+=ch;
        }
        if (temp.equals(s))//if the word is palindrome return as it is
            return s;
        else
        {
            String temp1="";
            for (int  i=len-2;i>=0;i--)
            {
                char ch= s.charAt(i); 
                temp1+=ch;
            }
            s+=temp1;
            return s;
        }
    }
    public static void main()
    {
        Scanner sc= new Scanner (System.in);
        System.out.println("Enter a sentence");
        String str= sc.nextLine();
        StringTokenizer stz= new StringTokenizer(str);
        System.out.println("The sentence with all the palindromic words is");
        while (stz.hasMoreTokens())     //To extract the words
        {
            String tmp= stz.nextToken();
            System.out.print(toPalin(tmp)+ " ");

        }
    }
}