allora....

codice:
import javax.swing.*;

public class StringaUtility{
	
	public static void main(String[] args){
		
		 String StrInp=JOptionPane.showInputDialog("Inserisci una stringa");
         String temp="";
         for(int i=StrInp.length()-1;i>=0;i--)
	         temp=temp+StrInp.charAt(i);
	     System.out.println(temp);
	     
     }
 }

tič