用Java语言写一个计算器界面，实现如下科学计算器界面，24个按键，并为按钮添加事件处理：当按钮被点击时将对应字符显示到顶部文本框中，使用Java Swing编写的简单计算器界面代码，还需要科学计算器

以下是一个简单的 Java Swing 科学计算器界面代码，实现了 24 个按键和对应的事件处理：

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

public class Calculator extends JFrame implements ActionListener {
    private JTextField textField;
    private JButton button0, button1, button2, button3, button4, button5, button6, button7, button8, button9;
    private JButton buttonAdd, buttonSubtract, buttonMultiply, buttonDivide, buttonEquals, buttonClear;
    private JButton buttonSqrt, buttonPow, buttonSin, buttonCos, buttonTan, buttonLog, buttonLn, buttonPi;
    private double num1, num2, result;
    private String operator;

    public Calculator() {
        super("Scientific Calculator");

        textField = new JTextField(30);
        textField.setEditable(false);
        textField.setHorizontalAlignment(JTextField.RIGHT);

        button0 = new JButton("0");
        button1 = new JButton("1");
        button2 = new JButton("2");
        button3 = new JButton("3");
        button4 = new JButton("4");
        button5 = new JButton("5");
        button6 = new JButton("6");
        button7 = new JButton("7");
        button8 = new JButton("8");
        button9 = new JButton("9");

        buttonAdd = new JButton("+");
        buttonSubtract = new JButton("-");
        buttonMultiply = new JButton("*");
        buttonDivide = new JButton("/");
        buttonEquals = new JButton("=");
        buttonClear = new JButton("C");

        buttonSqrt = new JButton("sqrt");
        buttonPow = new JButton("pow");
        buttonSin = new JButton("sin");
        buttonCos = new JButton("cos");
        buttonTan = new JButton("tan");
        buttonLog = new JButton("log");
        buttonLn = new JButton("ln");
        buttonPi = new JButton("pi");

        JPanel buttonPanel = new JPanel();
        buttonPanel.setLayout(new GridLayout(6, 4, 5, 5));
        buttonPanel.add(buttonSqrt);
        buttonPanel.add(buttonPow);
        buttonPanel.add(buttonSin);
        buttonPanel.add(buttonCos);
        buttonPanel.add(button7);
        buttonPanel.add(button8);
        buttonPanel.add(button9);
        buttonPanel.add(buttonDivide);
        buttonPanel.add(button4);
        buttonPanel.add(button5);
        buttonPanel.add(button6);
        buttonPanel.add(buttonMultiply);
        buttonPanel.add(button1);
        buttonPanel.add(button2);
        buttonPanel.add(button3);
        buttonPanel.add(buttonSubtract);
        buttonPanel.add(button0);
        buttonPanel.add(buttonPi);
        buttonPanel.add(buttonClear);
        buttonPanel.add(buttonAdd);
        buttonPanel.add(buttonLog);
        buttonPanel.add(buttonLn);
        buttonPanel.add(buttonTan);
        buttonPanel.add(buttonEquals);

        Container container = getContentPane();
        container.setLayout(new BorderLayout(5, 5));
        container.add(textField, BorderLayout.NORTH);
        container.add(buttonPanel, BorderLayout.CENTER);

        button0.addActionListener(this);
        button1.addActionListener(this);
        button2.addActionListener(this);
        button3.addActionListener(this);
        button4.addActionListener(this);
        button5.addActionListener(this);
        button6.addActionListener(this);
        button7.addActionListener(this);
        button8.addActionListener(this);
        button9.addActionListener(this);

        buttonAdd.addActionListener(this);
        buttonSubtract.addActionListener(this);
        buttonMultiply.addActionListener(this);
        buttonDivide.addActionListener(this);
        buttonEquals.addActionListener(this);
        buttonClear.addActionListener(this);

        buttonSqrt.addActionListener(this);
        buttonPow.addActionListener(this);
        buttonSin.addActionListener(this);
        buttonCos.addActionListener(this);
        buttonTan.addActionListener(this);
        buttonLog.addActionListener(this);
        buttonLn.addActionListener(this);
        buttonPi.addActionListener(this);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == button0) {
            textField.setText(textField.getText() + "0");
        } else if (e.getSource() == button1) {
            textField.setText(textField.getText() + "1");
        } else if (e.getSource() == button2) {
            textField.setText(textField.getText() + "2");
        } else if (e.getSource() == button3) {
            textField.setText(textField.getText() + "3");
        } else if (e.getSource() == button4) {
            textField.setText(textField.getText() + "4");
        } else if (e.getSource() == button5) {
            textField.setText(textField.getText() + "5");
        } else if (e.getSource() == button6) {
            textField.setText(textField.getText() + "6");
        } else if (e.getSource() == button7) {
            textField.setText(textField.getText() + "7");
        } else if (e.getSource() == button8) {
            textField.setText(textField.getText() + "8");
        } else if (e.getSource() == button9) {
            textField.setText(textField.getText() + "9");
        } else if (e.getSource() == buttonAdd) {
            num1 = Double.parseDouble(textField.getText());
            operator = "+";
            textField.setText("");
        } else if (e.getSource() == buttonSubtract) {
            num1 = Double.parseDouble(textField.getText());
            operator = "-";
            textField.setText("");
        } else if (e.getSource() == buttonMultiply) {
            num1 = Double.parseDouble(textField.getText());
            operator = "*";
            textField.setText("");
        } else if (e.getSource() == buttonDivide) {
            num1 = Double.parseDouble(textField.getText());
            operator = "/";
            textField.setText("");
        } else if (e.getSource() == buttonEquals) {
            num2 = Double.parseDouble(textField.getText());
            if (operator.equals("+")) {
                result = num1 + num2;
            } else if (operator.equals("-")) {
                result = num1 - num2;
            } else if (operator.equals("*")) {
                result = num1 * num2;
            } else if (operator.equals("/")) {
                result = num1 / num2;
            }
            textField.setText(Double.toString(result));
        } else if (e.getSource() == buttonClear) {
            textField.setText("");
        } else if (e.getSource() == buttonSqrt) {
            num1 = Double.parseDouble(textField.getText());
            result = Math.sqrt(num1);
            textField.setText(Double.toString(result));
        } else if (e.getSource() == buttonPow) {
            num1 = Double.parseDouble(textField.getText());
            operator = "pow";
            textField.setText("");
        } else if (e.getSource() == buttonSin) {
            num1 = Double.parseDouble(textField.getText());
            result = Math.sin(num1);
            textField.setText(Double.toString(result));
        } else if (e.getSource() == buttonCos) {
            num1 = Double.parseDouble(textField.getText());
            result = Math.cos(num1);
            textField.setText(Double.toString(result));
        } else if (e.getSource() == buttonTan) {
            num1 = Double.parseDouble(textField.getText());
            result = Math.tan(num1);
            textField.setText(Double.toString(result));
        } else if (e.getSource() == buttonLog) {
            num1 = Double.parseDouble(textField.getText());
            result = Math.log10(num1);
            textField.setText(Double.toString(result));
        } else if (e.getSource() == buttonLn) {
            num1 = Double.parseDouble(textField.getText());
            result = Math.log(num1);
            textField.setText(Double.toString(result));
        } else if (e.getSource() == buttonPi) {
            textField.setText(Double.toString(Math.PI));
        }
    }

    public static void main(String[] args) {
        Calculator calculator = new Calculator();
        calculator.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        calculator.setSize(400, 300);
        calculator.setLocationRelativeTo(null);
        calculator.setVisible(true);
    }
}

注意：以上代码只是一个简单的实现，还有很多缺陷和需要改进的地方，如输入错误处理、小数点处理、括号支持等等。