[hardwired]

Code:

//  <applet code="SumDigitApplet" width="300" height="120"></applet>
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JLabel;
import javax.swing.JApplet;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.JOptionPane;
import javax.swing.SwingConstants;

public class SumDigitApplet extends JApplet {
    private JTextField TextField1;
    private JLabel label1;
    private JTextField TextFieldSum, TextFieldReverse;

    public void init() {
        setLayout(new FlowLayout());

        TextField1=new JTextField(6);
        label1=new JLabel("Enter an Integer number:");
        label1.setVerticalAlignment(SwingConstants.TOP);
        add(label1);
        add(TextField1);

        TextFieldSum=new JTextField("",6);
        TextFieldReverse=new JTextField("",7);
        add(new JLabel("Sum of Digits:"));
        add(TextFieldSum);
        add(new JLabel("Reverse of Intege Entered:"));
        add(TextFieldReverse);
        TextHandler handler=new TextHandler();
        TextField1.addActionListener(handler);
    }

    private class TextHandler implements ActionListener {
        public void actionPerformed(ActionEvent event) { 
            int sum=0,result=1;
            String reverse="";
            int value=Integer.parseInt(event.getActionCommand());
            while(result!=0){
                result=value%10;
                sum+=result;
                reverse+=String.format("%d",result); 
                result=value/10;
                value=result;
            }
            TextFieldSum.setText(String.format("%d",sum));
            TextFieldReverse.setText(reverse);
        }
    }

    public static void main(String args[]){
        JApplet applet = new SumDigitApplet();
        JFrame f = new JFrame("Sum Digits of Integer");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(applet);
        f.setSize(300,120);
        f.setLocation(300,200);
        applet.init();
        f.setVisible(true);
    }
}