Question

I see a program to reverse a string

public class ReverseName{
    public static void main(String[]args)
    {
        String name=args[0];
        String reverse=new StringBuffer(name).reverse().toString();
        System.out.println(reverse);
    }
}

so what is new StringBuffer(name).reverse().toString(); all about?

Answer 1

String reverse=new StringBuffer(name).reverse().toString();

Let’s break this down.

new StringBuffer(name)

First off we create a new StringBuffer (I’d have used StringBuilder as we don’t need thread safety) with the contents of name. This just allows a more peformant way to append strings but here it’s used for the next part.

.reverse()

This calls the reverse method on the StringBuffer which returns a reversed StringBuffer.

.toString();

Finally this is turned back into a String.