Add the following to this working java code: 1. The interface method should veri

Question

Add the following to this working java code:

1. The interface method should verify that the string has at least one character, and display an appropriate error message if necessary.

2. Your main method should use a do-while loop to allow the user to check multiple strings.

import java.util.Scanner;

public class PolyndromTest {

public static void main(String[] args) {
Scanner inScanner = new Scanner(System.in);
System.out.println("Enter a string: ");
String text = inScanner.nextLine();
if (isPolindrome(text)) {
System.out.println(text + " is polindrome ");
} else {
System.out.println(text + " is not polindrome ");
}

}

private static boolean isPolindrome(String str) {

str = str.toUpperCase();
str = str.replaceAll("[^A-Za-z]", "");
if (str.length() == 0 || str.length() == 1)
return true;// if length =0 OR 1 then it is
else if (str.charAt(0) == str.charAt(str.length() - 1))
return isPolindrome(str.substring(1, str.length() - 1));
return false;

}

}

P.S. I will give rating.

P.S.S. Please ignore my current  "Answer rated %." It is false.

Explanation / Answer

package mypro;

import java.util.Scanner;

public class PolyndromTest {
    private static boolean isPolindrome(String str) {

        str = str.toUpperCase();
        str = str.replaceAll("[^A-Za-z]", "");
        if (str.length() == 0 || str.length() == 1)
            return true;// if length =0 OR 1 then it is
        else if (str.charAt(0) == str.charAt(str.length() - 1))
            return isPolindrome(str.substring(1, str.length() - 1));
        return false;
        }
    static void checkchar(String str){
        int count=0;
        for(int i=0;i<str.length();i++){
            char ch = str.charAt(i);
            if((ch>=65 && ch <=90) || (ch>=97 && ch <=122)){
                count++;
            }       
        }
        if(count == str.length()){
            System.out.println(" String has atleast one character");
        }
        else{
            System.out.println("Error: String has other charcter also");
        }
    }
    public static void main(String[] args) {
        String str="";
        do{
            Scanner inScanner = new Scanner(System.in);
            System.out.println("Enter a string: ");
            String text = inScanner.nextLine();
            checkchar(text);
            if (isPolindrome(text)) {
                System.out.println(text + " is polindrome ");
            } else {
                System.out.println(text + " is not polindrome ");
            }
            System.out.print("Do you want more yes/no=");
            str = inScanner.nextLine();
    }while(str.equals("yes"));

}
}

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