JAVA String Reverse using StringBuilder

Question

This code always returns false. What might be the problem ?

  public class S18_Palindrome {
      public static void main(String[] args) {
        String myString = new String("malayalam");
        if (myString.equals(new StringBuilder(myString).reverse())) {
          System.out.println("true");
        } else {
          System.out.println("false");
        }
      }
    }

J-J · Accepted Answer · 2017-01-16 11:23:21Z

6

The problem is that StringBuilder(myString).reverse() will return a StringBuilder object you need to get the string value out of it.

new StringBuilder(myString).reverse().toString()

answered Jan 16, 2017 at 11:23

J-J

5,9206 gold badges43 silver badges58 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Anu Shibin Joseph Raj · Accepted Answer · 2017-01-16 11:23:01Z

1

Got it :)

I had to convert the StringBuilder's value toString()

if (myString.equals(new StringBuilder(myString).reverse().toString()))

instead of

if (myString.equals(new StringBuilder(myString).reverse()))

answered Jan 16, 2017 at 11:23

Anu Shibin Joseph Raj

1,0951 gold badge13 silver badges31 bronze badges

Comments

Vishal Jadav · Accepted Answer · 2017-01-16 11:24:07Z

-1

Try this..

String s = "responses";
StringBuilder builder = new StringBuilder(s);
System.out.println(builder.reverse());

answered Jan 16, 2017 at 11:24

Vishal Jadav

9829 silver badges12 bronze badges

2 Comments

Vishal Jadav Over a year ago

it is just example of check reverse string.

marstran Over a year ago

But he asked why myString.equals(new StringBuilder(myString).reverse()) always returns false..

Collectives™ on Stack Overflow

JAVA String Reverse using StringBuilder

3 Answers 3

Comments

Comments

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related