Thread: What am I doing wrong?

Hi, can someone help we please?
I need to write a temperature-conversion application that converts from fahrenheit to celsius. The temperature should be entered from the keyboard(via a jtextfield). And a label should be used to display the converted temperature.

This is mine code:

import java.awt.FlowLayout;
import java.awt.GridLayout;
import javax.swing.JTextField;
import javax.swing.JLabel;
import javax.swing.JFrame;
import javax.swing.JPanel;
 
 
public class Conversion extends JFrame{
    private final JTextField fField;
    private final JLabel cLabel;
    private final JLabel label;
    private final JLabel fLabel;
    private final JPanel panel;
    private final JPanel fPanel;
    private final JPanel cPanel;
 
 
    public Conversion(){
        super("Temperature Conversion");
        setLayout(new FlowLayout());
 
        panel = new JPanel(new GridLayout(2,1));
        fPanel = new JPanel(new GridLayout(1,2));
        cPanel = new JPanel(new GridLayout(1,2));
 
        fLabel = new JLabel("Enter fahrenheit: ");
        fField = new JTextField(5);
        fPanel.add(fLabel);
        fPanel.add(fField);
 
        int f = Integer.parseInt(fField.getText());
        int c = 5/9 * (f - 32);
 
        label = new JLabel();
        label.setText(Integer.toString(c));
        cLabel = new JLabel("Celsius: ");
        cPanel.add(cLabel);
        cPanel.add(label);
 
        panel.add(fPanel);
        panel.add(cPanel);
 
        add(panel);
    }
}

This is the error i'm getting:
Exception in thread "main" java.lang.NumberFormatException: For input string: ""
at java.base/java.lang.NumberFormatException.forInputString(Num berFormatException.java:65)
at java.base/java.lang.Integer.parseInt(Integer.java:662)
at java.base/java.lang.Integer.parseInt(Integer.java:770)
at Conversion.<init>(Conversion.java:32)
at ConversionTest.main(ConversionTest.java:5)
C:\Users\Maneesha\AppData\Local\NetBeans\Cache\10. 0\executor-snippets\run.xml:111: The following error occurred while executing this line:
C:\Users\Maneesha\AppData\Local\NetBeans\Cache\10. 0\executor-snippets\run.xml:68: Java returned: 1

it's still not working