Java计算器ActionListener。如何在除以零时更改消息"Infinity“？

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

public class Calculator extends JFrame {
    private JTextField textField;
    private JButton divideButton;

    public Calculator() {
        setTitle("Java计算器");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new FlowLayout());

        textField = new JTextField(10);
        add(textField);

        divideButton = new JButton("除法");
        divideButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                try {
                    double dividend = Double.parseDouble(textField.getText());
                    double divisor = 0.0;

                    if (divisor == 0.0) {
                        textField.setText("Infinity");
                    } else {
                        double result = dividend / divisor;
                        textField.setText(String.valueOf(result));
                    }
                } catch (NumberFormatException ex) {
                    textField.setText("Invalid input");
                }
            }
        });
        add(divideButton);

        pack();
        setVisible(true);
    }

    public static void main(String[] args) {
        new Calculator();
    }
}