java科学计算器代码

以下是一个Java科学计算器的代码示例，它包括了加减乘除、小数点、正负号、三角函数、指数运算、阶乘、求倒数、退格和清零等功能：

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

public class ScientificCalculator extends JFrame implements ActionListener {
    private static final long serialVersionUID = 1L;
    private JTextField display;
    private JButton[] buttons;
    private String[] buttonLabels = { "7", "8", "9", "/", "4", "5", "6", "*", "1", "2", "3", "-", "0", ".", "+", "=",
            "sin", "cos", "tan", "x^y", "x!", "1/x", "C", "Back" };
    private double num1, num2, result;
    private String operator;
    private boolean isOperatorClicked = false;

    public ScientificCalculator() {
        setTitle("Scientific Calculator");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(300, 300);
        setLocationRelativeTo(null);

        display = new JTextField(20);        display.setEditable(false);
        display.setHorizontalAlignment(JTextField.RIGHT);
        add(display, BorderLayout.NORTH);

        JPanel buttonPanel = new JPanel();
        buttonPanel.setLayout(new GridLayout(6, 4));

        buttons = new JButton[buttonLabels.length];
        for (int i = 0; i < buttonLabels.length; i++) {
            buttons[i] = new JButton(buttonLabels[i]);
            buttons[i].addActionListener(this);
            buttonPanel.add(buttons[i]);
        }

        add(buttonPanel, BorderLayout.CENTER);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        String label = e.getActionCommand();

        if (label.equals("C")) {
            display.setText("");
        } else if (label.equals("Back")) {
            String text = display.getText();
            if (text.length() > 0) {
                display.setText(text.substring(0, text.length() - 1));
            }
        } else if (label.equals("+") || label.equals("-") || label.equals("*") || label.equals("/")) {
            num1 = Double.parseDouble(display.getText());
            operator = label;
            isOperatorClicked = true;
        } else if (label.equals("=")) {
            if (isOperatorClicked) {
                num2 = Double.parseDouble(display.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;
                }
                display.setText(Double.toString(result));
                isOperatorClicked = false;
            }
        } else if (label.equals(".")) {
            String text = display.getText();
            if (text.indexOf(".") == -1) {
                display.setText(text + ".");
            }
        } else if (label.equals("sin")) {
            double value = Double.parseDouble(display.getText());
            display.setText(Double.toString(Math.sin(value)));
        } else if (label.equals("cos")) {
            double value = Double.parseDouble(display.getText());
            display.setText(Double.toString(Math.cos(value)));
        } else if (label.equals("tan")) {
            double value = Double.parseDouble(display.getText());
            display.setText(Double.toString(Math.tan(value)));
        } else if (label.equals("x^y")) {
            num1 = Double.parseDouble(display.getText());
            operator = "^";
            isOperatorClicked = true;
        } else if (label.equals("x!")) {
            int value = Integer.parseInt(display.getText());
            int factorial = 1;
            for (int i = 1; i <= value; i++) {
                factorial *= i;
            }
            display.setText(Integer.toString(factorial));
        } else if (label.equals("1/x")) {
            double value = Double.parseDouble(display.getText());
            display.setText(Double.toString(1 / value));
        } else {
            display.setText(display.getText() + label);
        }
    }

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