javagui中做一个图形界面计算器包含四则运算，带Π的三角函数运算，并可以清空界面

下面是一个简单的Java GUI计算器的实现，可以进行四则运算和三角函数运算，并且可以清空界面：

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.math.BigDecimal;
import java.math.MathContext;
import java.math.RoundingMode;

public class CalculatorGUI extends JFrame implements ActionListener {
    private final JButton[] numberButtons = new JButton[10];
    private final JButton[] functionButtons = new JButton[8];
    private final JButton addButton, minusButton, multiplyButton, divideButton, dotButton, equalButton, clearButton, piButton;
    private final JTextField textField;

    private double num1 = 0, num2 = 0;
    private char operator;
    private boolean isDotPressed = false;

    public CalculatorGUI() {
        setTitle("Java GUI Calculator");
        setSize(400, 400);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);

        JPanel panel = new JPanel();
        panel.setLayout(new GridBagLayout());
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.weightx = 1;
        gbc.weighty = 1;
        gbc.gridx = 0;
        gbc.gridy = 0;
        gbc.gridwidth = 4;

        textField = new JTextField();
        textField.setEditable(false);
        panel.add(textField, gbc);

        gbc.gridwidth = 1;
        gbc.gridy = 1;

        clearButton = new JButton("C");
        clearButton.addActionListener(this);
        panel.add(clearButton, gbc);

        piButton = new JButton("π");
        piButton.addActionListener(this);
        panel.add(piButton, gbc);

        addButton = new JButton("+");
        addButton.addActionListener(this);
        panel.add(addButton, gbc);

        minusButton = new JButton("-");
        minusButton.addActionListener(this);
        panel.add(minusButton, gbc);

        multiplyButton = new JButton("*");
        multiplyButton.addActionListener(this);
        panel.add(multiplyButton, gbc);

        divideButton = new JButton("/");
        divideButton.addActionListener(this);
        panel.add(divideButton, gbc);

        gbc.gridx = 0;
        gbc.gridy = 2;

        for (int i = 0; i < 10; i++) {
            numberButtons[i] = new JButton(String.valueOf(i));
            numberButtons[i].addActionListener(this);

            if (i == 0) {
                gbc.gridwidth = 2;
                panel.add(numberButtons[i], gbc);
                gbc.gridwidth = 1;
            } else {
                panel.add(numberButtons[i], gbc);
            }

            gbc.gridx++;

            if (gbc.gridx > 2) {
                gbc.gridx = 0;
                gbc.gridy++;
            }
        }

        dotButton = new JButton(".");
        dotButton.addActionListener(this);
        panel.add(dotButton, gbc);

        equalButton = new JButton("=");
        equalButton.addActionListener(this);
        panel.add(equalButton, gbc);

        functionButtons[0] = new JButton("sin");
        functionButtons[1] = new JButton("cos");
        functionButtons[2] = new JButton("tan");
        functionButtons[3] = new JButton("asin");
        functionButtons[4] = new JButton("acos");
        functionButtons[5] = new JButton("atan");
        functionButtons[6] = new JButton("sqrt");
        functionButtons[7] = new JButton("log");

        gbc.gridy++;

        for (int i = 0; i < 8; i++) {
            functionButtons[i].addActionListener(this);
            panel.add(functionButtons[i], gbc);
            gbc.gridx++;

            if (gbc.gridx > 2) {
                gbc.gridx = 0;
                gbc.gridy++;
            }
        }

        add(panel);
        setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == clearButton) {
            textField.setText("");
            num1 = 0;
            num2 = 0;
            operator = ' ';
            isDotPressed = false;
        } else if (e.getSource() == piButton) {
            textField.setText(String.valueOf(Math.PI));
            num1 = Math.PI;
        } else if (e.getSource() == addButton) {
            num1 = Double.parseDouble(textField.getText());
            operator = '+';
            textField.setText("");
            isDotPressed = false;
        } else if (e.getSource() == minusButton) {
            num1 = Double.parseDouble(textField.getText());
            operator = '-';
            textField.setText("");
            isDotPressed = false;
        } else if (e.getSource() == multiplyButton) {
            num1 = Double.parseDouble(textField.getText());
            operator = '*';
            textField.setText("");
            isDotPressed = false;
        } else if (e.getSource() == divideButton) {
            num1 = Double.parseDouble(textField.getText());
            operator = '/';
            textField.setText("");
            isDotPressed = false;
        } else if (e.getSource() == equalButton) {
            num2 = Double.parseDouble(textField.getText());

            switch (operator) {
                case '+':
                    textField.setText(String.valueOf(num1 + num2));
                    break;
                case '-':
                    textField.setText(String.valueOf(num1 - num2));
                    break;
                case '*':
                    textField.setText(String.valueOf(num1 * num2));
                    break;
                case '/':
                    textField.setText(String.valueOf(num1 / num2));
                    break;
            }

            num1 = Double.parseDouble(textField.getText());
            num2 = 0;
            isDotPressed = false;
        } else if (e.getSource() == dotButton) {
            if (!isDotPressed) {
                textField.setText(textField.getText() + ".");
                isDotPressed = true;
            }
        } else if (e.getSource() == functionButtons[0]) {
            double value = Double.parseDouble(textField.getText());
            double result = Math.sin(Math.toRadians(value));
            textField.setText(String.valueOf(result));
            num1 = result;
            isDotPressed = false;
        } else if (e.getSource() == functionButtons[1]) {
            double value = Double.parseDouble(textField.getText());
            double result = Math.cos(Math.toRadians(value));
            textField.setText(String.valueOf(result));
            num1 = result;
            isDotPressed = false;
        } else if (e.getSource() == functionButtons[2]) {
            double value = Double.parseDouble(textField.getText());
            double result = Math.tan(Math.toRadians(value));
            textField.setText(String.valueOf(result));
            num1 = result;
            isDotPressed = false;
        } else if (e.getSource() == functionButtons[3]) {
            double value = Double.parseDouble(textField.getText());
            double result = Math.asin(Math.toRadians(value));
            textField.setText(String.valueOf(result));
            num1 = result;
            isDotPressed = false;
        } else if (e.getSource() == functionButtons[4]) {
            double value = Double.parseDouble(textField.getText());
            double result = Math.acos(Math.toRadians(value));
            textField.setText(String.valueOf(result));
            num1 = result;
            isDotPressed = false;
        } else if (e.getSource() == functionButtons[5]) {
            double value = Double.parseDouble(textField.getText());
            double result = Math.atan(Math.toRadians(value));
            textField.setText(String.valueOf(result));
            num1 = result;
            isDotPressed = false;
        } else if (e.getSource() == functionButtons[6]) {
            double value = Double.parseDouble(textField.getText());
            double result = Math.sqrt(value);
            textField.setText(String.valueOf(result));
            num1 = result;
            isDotPressed = false;
        } else if (e.getSource() == functionButtons[7]) {
            double value = Double.parseDouble(textField.getText());
            double result = Math.log10(value);
            textField.setText(String.valueOf(result));
            num1 = result;
            isDotPressed = false;
        } else {
            for (int i = 0; i < 10; i++) {
                if (e.getSource() == numberButtons[i]) {
                    textField.setText(textField.getText() + i);
                    num1 = Double.parseDouble(textField.getText());
                    break;
                }
            }
        }
    }

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

该计算器支持输入数字、小数点、四则运算符号、Π、清空操作以及一些基本的三角函数和其他函数。界面使用了Java Swing库中的JPanel和JButton组件，通过GridBagLayout布局实现了简单的排版。在每次操作后，将当前的操作数和运算符保存下来，以便进行连续计算，并在等号按钮被按下时根据运算符进行计算。对于一些特殊的函数操作（例如sin、cos、tan等），使用了Java Math库中的函数实现。