uni[correct]

import javax.swing.JOptionPane;
 public class pears {
   public static void main(String[] args) {
	   int total = 0;
	   String X = JOptionPane.showInputDialog(null, "enter nums please");
	   int prevIndex = 0;
	   int index = 0;
	   while (index > -1) {
	     index = X.indexOf(' ', prevIndex);
	     if (index > -1) {
	       total += Integer.parseInt(X.substring(prevIndex, index));
	       prevIndex = index + 1;
	     } else {
	       total += Integer.parseInt(X.substring(X.lastIndexOf(' ')+1));
	   break;
	     }
	   }
	   JOptionPane.showMessageDialog(null, "the sum is " + total);
   }
}