jframe制作计算器

好的，以下是一个简单的JFrame计算器示例代码，你可以根据自己的需要进行修改：

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

public class Calculator extends JFrame implements ActionListener {
    private JTextField textField;
    private JButton[] buttons;
    private String[] buttonText = {"7", "8", "9", "+", "4", "5", "6", "-", "1", "2", "3", "*", ".", "0", "=", "/"};
    private JPanel panel;

    public Calculator() {
        setTitle("Calculator");
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setResizable(false);

        textField = new JTextField(10);
        textField.setEditable(false);
        textField.setFont(new Font("Arial", Font.PLAIN, 20));
        textField.setHorizontalAlignment(JTextField.RIGHT);

        buttons = new JButton[buttonText.length];
        for (int i = 0; i < buttonText.length; i++) {
            buttons[i] = new JButton(buttonText[i]);
            buttons[i].setFont(new Font("Arial", Font.PLAIN, 20));
            buttons[i].addActionListener(this);
        }

        panel = new JPanel();
        panel.setLayout(new GridLayout(4, 4, 5, 5));
        for (JButton button : buttons) {
            panel.add(button);
        }

        getContentPane().add(textField, BorderLayout.NORTH);
        getContentPane().add(panel, BorderLayout.CENTER);

        pack();
        setLocationRelativeTo(null);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        String command = e.getActionCommand();
        if (command.equals("=")) {
            String expression = textField.getText();
            textField.setText(String.valueOf(CalculatorEngine.evaluate(expression)));
        } else {
            textField.setText(textField.getText() + command);
        }
    }

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

class CalculatorEngine {
    public static double evaluate(String expression) {
        //使用JavaScript引擎计算表达式
        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByName("JavaScript");

        try {
            return (double) engine.eval(expression);
        } catch (ScriptException e) {
            e.printStackTrace();
            return Double.NaN;
        }
    }
}

这个计算器使用了 GridLayout 来布局按钮，使用 JavaScript 引擎来计算表达式。