Everything works fine, except for one thing. I need this program to show a messa

Question

Everything works fine, except for one thing.

I need this program to show a message in the event the user inputs anything else instead of numbers.

This is what it looks like when running:

I NEED IT TO DISPLAY THIS IF USER INPUTS OTHER THAN NUMBERS:

Here is the source:

import javax.swing.JPanel;
import java.awt.*;
import java.awt.event.ActionEvent;
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((ActionEvent ae) -> {
            int temp1 = Integer.parseInt(jpt6.getText());
            float far = ((temp1 * 9) / 5) + 32;
           celAns.setText(far +" °F");
        });
       
        jpt11.addActionListener((ActionEvent ae) -> {
            int temp2 = Integer.parseInt(jpt9.getText());
            float cel = ((temp2 -32) * 5/ 9);
           farAns.setText(cel +" °C");
        });
       
        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);
    }
}

Explanation / Answer

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class FtoCConversionTest{
   public static void main(String[] args){
       EventQueue.invokeLater(new Runnable(){
           public void run(){
               ConvertorFrame frame = new

ConvertorFrame();
              

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
               frame.setVisible(true);
           }
       });
   }
}

class ConvertorFrame extends JFrame{
  
   public ConvertorFrame(){
       setTitle("Fahrenheit to Celsius Calculator");
       ConvertorPanel panel = new ConvertorPanel();
        add(panel);
       pack();
   }
}
  
class ConvertorPanel extends JPanel{
  
   public ConvertorPanel(){
      
       setLayout(new BorderLayout());
       //add the panel
       panel = new JPanel();
      
       //add JTextField and position it
       textField = new JTextField();
        JPanel northPanel = new JPanel();
        northPanel.setLayout(new GridLayout(2,1));
        //add the text field label and position it
        northPanel.add(new JLabel("Type the number to

convert below: ", SwingConstants.LEFT));
        northPanel.add(textField);
        add(northPanel, BorderLayout.NORTH);
      
       //set the panel and position it
       panel.setLayout(new GridLayout(1,2));
       //add buttons and position them
       cButton = new JButton("Convert to Celsius");
       panel.add(cButton);
       fButton = new JButton("Convert to

Fahrenheit");
       panel.add(fButton);
       add(panel, BorderLayout.SOUTH);
      
       Converter converter = new Converter();
       cButton.addActionListener(converter);
       fButton.addActionListener(converter);
      
   }
   private class Converter implements ActionListener{
      
       public void actionPerformed (ActionEvent

event){
          
           if (event.getSource() == cButton){
               int c = (int)

(((Double.parseDouble(textField.getText()))- 32) * 0.56);
                textField.setText(c + " °C");
                textField.requestFocus();
                textField.selectAll();
           }
           else if(event.getSource() == fButton){
               int f = (int)(((Double.parseDouble

(textField.getText()))* 1.8) + 32);
               textField.setText(f + " ºF");
               textField.requestFocus();
               textField.selectAll();
           }
       }
   }
   private JButton cButton, fButton;
   private JTextField textField;
   private JPanel panel;
}

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