My code is not sending out the message correctly. I want the message to show if

Question

My code is not sending out the message correctly. I want the message to show if a "letter" is inputted not when a "number" is inputted.

The message is backwards and just needs to be modified slightly to only show when the user inputs a letter. I have the messenger identified in "BOLD".

Inputting a number as shown below:

Source code (Netbeans)

import javax.swing.JPanel;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;

public class CelsiusConverter extends JPanel {
   
     private final JTextField jpt6;
     private final JLabel jpt7;
     private JLabel celAns;
     private final JButton jpt8;
     private final JTextField jpt9;
     private final JLabel jpt10;
     private JLabel farAns;
     private final JButton jpt11;
   
     public CelsiusConverter() {
       
         jpt6 = new JTextField(5);
         jpt7 = new JLabel("Celsius");
         celAns = new JLabel("");
         jpt8 = new JButton("Convert");
         jpt9 = new JTextField(5);
         jpt10 = new JLabel("Farenheit");
         farAns = new JLabel("");
         jpt11 = new JButton("Convert");
    

        setPreferredSize (new Dimension (325,200));
         setLayout (null);
       
         add (jpt6);
         add (jpt7);
         add (jpt8);
         add(celAns);
         add (jpt9);
         add (jpt10);
         add (jpt11);
         add (farAns);

         jpt8.addActionListener(new ActionListener() {

             public void actionPerformed(ActionEvent ae) {
                 int temp1 = Integer.parseInt(jpt6.getText());
                 float far = ((temp1 * 9) / 5) + 32;
                 celAns.setText(far +" °F");
                
                 //Notify numbers only
                 JOptionPane.showMessageDialog(null,
                         "Input numbers only!.",
                         "Input warning",
                         JOptionPane.WARNING_MESSAGE);
             }
         });
       
         jpt11.addActionListener(new ActionListener() {

             public void actionPerformed(ActionEvent ae) {
                 int temp2 = Integer.parseInt(jpt9.getText());
                 float cel = ((temp2 -32) * 5/ 9);
                 farAns.setText(cel +" °C");
                
                //Notify numbers only
                 JOptionPane.showMessageDialog(null,
                         "Input numbers only!.",
                         "Input warning",
                         JOptionPane.WARNING_MESSAGE);
             }
         });
       
         jpt6.setBounds (45, 95, 50, 25);
         jpt7.setBounds (105, 95, 50, 25);
         celAns.setBounds(50, 125, 100, 25);
         jpt8.setBounds (25, 155, 85, 25);
         jpt9.setBounds (235, 95, 50, 25);
         jpt10.setBounds (175, 95, 100, 25);
         jpt11.setBounds (215, 155, 85, 25);
         farAns.setBounds(235, 125, 100, 25);

    }

     public static void main (String[] args) {
         JFrame frame = new JFrame ("Converter");
         frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
         frame.getContentPane().add (new CelsiusConverter());
         frame.pack();
         frame.setVisible (true);
     }
}

Shows this error:

Explanation / Answer

//Notify numbers only
                 JOptionPane.showMessageDialog(input,     
                         "Input numbers only!.",
                         "Input warning",
                         JOptionPane.WARNING_MESSAGE);
             }

//Notify numbers only
                 JOptionPane.showMessageDialog(input,
                         "Input numbers only!.",
                         "Input warning",
                         JOptionPane.WARNING_MESSAGE)

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