JAVAGUI俩数相加

以下是一个Java GUI实现俩数相加的例子：

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

public class AddTwoNumbers extends JFrame implements ActionListener {
    private JTextField firstNumberTextField, secondNumberTextField, resultTextField;
    private JButton addButton;

    public AddTwoNumbers() {
        setTitle("Add Two Numbers");
        setSize(400, 200);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);

        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(4, 2));

        JLabel firstNumberLabel = new JLabel("First Number:");
        firstNumberTextField = new JTextField();
        JLabel secondNumberLabel = new JLabel("Second Number:");
        secondNumberTextField = new JTextField();
        JLabel resultLabel = new JLabel("Result:");
        resultTextField = new JTextField();
        resultTextField.setEditable(false);

        addButton = new JButton("Add");
        addButton.addActionListener(this);

        panel.add(firstNumberLabel);
        panel.add(firstNumberTextField);
        panel.add(secondNumberLabel);
        panel.add(secondNumberTextField);
        panel.add(resultLabel);
        panel.add(resultTextField);
        panel.add(addButton);

        add(panel);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == addButton) {
            try {
                int firstNumber = Integer.parseInt(firstNumberTextField.getText());
                int secondNumber = Integer.parseInt(secondNumberTextField.getText());
                int result = firstNumber + secondNumber;
                resultTextField.setText(Integer.toString(result));
            } catch (NumberFormatException ex) {
                JOptionPane.showMessageDialog(this, "Please enter valid numbers", "Error", JOptionPane.ERROR_MESSAGE);
            }
        }
    }

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