I am checking for pallindrome string..Why does this always print yes

Question

public static void main(String[] args) {  
  Scanner sc=new Scanner(System.in);
  String A=sc.next();
  StringBuffer a1 = new StringBuffer();
  a1.append(A);
  System.out.println(a1.equals(a1.reverse())?"Yes":"No");
}

Does this answer to your question https://stackoverflow.com/questions/4138827/check-string-for-palindrome — Prathamesh More, Sep 13 '20 at 16:19
Does this answer your question? [Check string for palindrome](https://stackoverflow.com/questions/4138827/check-string-for-palindrome) — Abra, Sep 13 '20 at 16:58

Pramod · Accepted Answer · 2020-09-13T16:17:31.690

This will always return yes as a1.reverse() returns original StringBuffer object which is same as a1. If you want to compare string, you have to generate string from stringbuffer object:

public static void main (String[] args) {
    Scanner sc=new Scanner(System.in);
    String A=sc.next();
    StringBuffer a1 = new StringBuffer();
    a1.append(A);
    System.out.println(a1.toString().equals(a1.reverse().toString())?"Yes":"No");
}

score 0 · Answer 2 · answered Sep 13 '20 at 17:06

0

Yes by converting it into a string first you would be able to compare them . Otherwise you would be comparing there address(StringBuffer address),which is same is case of both.

answered Sep 13 '20 at 17:06

sukhanjot singh

1

I am checking for pallindrome string..Why does this always print yes

2 Answers2