Selenium : Extract only digits from a string ( try ....catch )

                                                Extract only digits from a string

import javax.swing.JOptionPane;
import org.apache.commons.lang3.StringUtils;
public class extract_digits
{
 public static void main(String[] args)
 {
 String sStr=JOptionPane.showInputDialog("Enter any string with Digit");
 String sRes="";
 int sTemp;

 for (int i=1 ; i<=sStr.length();i++)
 {
   try
   {
     sTemp=Integer.parseInt(StringUtils.mid(sStr, i, 1));//substring(sStr, 1, end)
     sRes=sRes+"\n"+sTemp;
   
   }catch (Exception  e)
   { 
   }
 }

 System.out.println(sRes);
}
}