calculator generated by CodeGemma 7B

Calculator.java

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

public class Calculator extends JFrame implements ActionListener {

    private JTextField textField;
    private JButton[] numberButtons;
    private JButton[] operatorButtons;
    private JButton clearButton;
    private JButton equalsButton;

    private double firstNumber;
    private double secondNumber;
    private String operator;

    public Calculator() {
        // Set up the frame
        setTitle("Calculator");
        setSize(400, 400);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // Create the text field
        textField = new JTextField();
        textField.setFont(new Font("Arial", Font.BOLD, 20));
        textField.setHorizontalAlignment(JTextField.RIGHT);
        add(textField, BorderLayout.NORTH);

        // Create the number buttons
        numberButtons = new JButton[10];
        for (int i = 0; i < 10; i++) {
            numberButtons[i] = new JButton(String.valueOf(i));
            numberButtons[i].addActionListener(this);
        }

        // Create the operator buttons
        operatorButtons = new JButton[] {
                new JButton("+"),
                new JButton("-"),
                new JButton("*"),
                new JButton("/")
        };
        for (JButton button : operatorButtons) {
            button.addActionListener(this);
        }

        // Create the clear button
        clearButton = new JButton("C");
        clearButton.addActionListener(this);

        // Create the equals button
        equalsButton = new JButton("=");
        equalsButton.addActionListener(this);

        // Add the buttons to the frame
        JPanel buttonPanel = new JPanel();
        buttonPanel.setLayout(new GridLayout(4, 4));
        for (int i = 0; i < 10; i++) {
            buttonPanel.add(numberButtons[i]);
        }
        for (JButton button : operatorButtons) {
            buttonPanel.add(button);
        }
        buttonPanel.add(clearButton);
        buttonPanel.add(equalsButton);
        add(buttonPanel, BorderLayout.CENTER);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        String command = e.getActionCommand();

        // Handle number button clicks
        if (command.matches("\\d")) {
            textField.setText(textField.getText() + command);
        }

        // Handle operator button clicks
        if (command.matches("[+\\-*/]")) {
            firstNumber = Double.parseDouble(textField.getText());
            operator = command;
            textField.setText("");
        }

        // Handle clear button click
        if (command.equals("C")) {
            textField.setText("");
            firstNumber = 0;
            secondNumber = 0;
            operator = null;
        }

        // Handle equals button click
        if (command.equals("=")) {
            secondNumber = Double.parseDouble(textField.getText());
            double result = 0;
            switch (operator) {
                case "+":
                    result = firstNumber + secondNumber;
                    break;
                case "-":
                    result = firstNumber - secondNumber;
                    break;
                case "*":
                    result = firstNumber * secondNumber;
                    break;
                case "/":
                    result = firstNumber / secondNumber;
                    break;
            }
            textField.setText(String.valueOf(result));
        }
    }

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

prompt is "generate a calculator in Java swing"
https://gist.github.com/assets/1178746/42461b77-3e03-421b-9b24-aff24cfbf937