使用Java生成计算器 ，实现基本数学运算、函数等功能:加、减、乘、除、阶乘、正弦、余弦和指数的多则运算

好的，以下是一个基于JavaFX实现的计算器示例，支持加减乘除、阶乘、正弦、余弦和指数等多则运算：

Calculator.java

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;

public class Calculator extends Application {

    private TextField inputField;
    private Label resultLabel;

    @Override
    public void start(Stage primaryStage) throws Exception {
        // 创建界面布局
        GridPane gridPane = new GridPane();
        gridPane.setPadding(new Insets(10));
        gridPane.setVgap(10);
        gridPane.setHgap(10);

        // 创建输入框和结果标签
        inputField = new TextField();
        inputField.setPrefWidth(200);
        resultLabel = new Label();

        // 创建数字键和运算符键
        Button[][] buttons = new Button[4][5];
        String[][] buttonLabels = {
                {"7", "8", "9", "+", "C"},
                {"4", "5", "6", "-", "x!"},
                {"1", "2", "3", "*", "sin"},
                {"0", ".", "=", "/", "cos"}
        };
        for (int i = 0; i < 4; i++) {
            for (int j = 0; j < 5; j++) {
                Button button = new Button(buttonLabels[i][j]);
                button.setPrefWidth(50);
                button.setOnAction(event -> {
                    String label = button.getText();
                    String text = inputField.getText();
                    if (label.equals("C")) {
                        inputField.setText("");
                        resultLabel.setText("");
                    } else if (label.equals("=")) {
                        try {
                            double result = calculate(text);
                            resultLabel.setText(String.format("%.2f", result));
                        } catch (Exception e) {
                            resultLabel.setText("Error!");
                        }
                    } else {
                        inputField.setText(text + label);
                    }
                });
                buttons[i][j] = button;
                gridPane.add(button, j, i + 1);
            }
        }

        // 添加输入框和结果标签
        gridPane.add(inputField, 0, 0, 4, 1);
        gridPane.add(resultLabel, 4, 0, 1, 2);

        // 创建场景和窗口
        Scene scene = new Scene(gridPane);
        primaryStage.setTitle("Calculator");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    // 计算表达式的值
    private double calculate(String expression) {
        expression = expression.replaceAll("sin", "s");
        expression = expression.replaceAll("cos", "c");
        expression = expression.replaceAll("x!", "!"); // 将乘法因子阶乘符号替换为!

        String[] tokens = expression.split("(?<=[+\\-*/!sct])|(?=[+\\-*/!sct])");
        double result = Double.parseDouble(tokens[0]);
        for (int i = 1; i < tokens.length; i += 2) {
            String operator = tokens[i];
            double operand = Double.parseDouble(tokens[i + 1]);
            switch (operator) {
                case "+":
                    result += operand;
                    break;
                case "-":
                    result -= operand;
                    break;
                case "*":
                    result *= operand;
                    break;
                case "/":
                    if (operand == 0) {
                        throw new ArithmeticException("Divide by zero error!");
                    }
                    result /= operand;
                    break;
                case "!":
                    if (result < 0 || result != (int) result) {
                        throw new IllegalArgumentException("Invalid operand for factorial!");
                    }
                    result = Calculator.factorial((int) result);
                    break;
                case "s":
                    result = Math.sin(Math.toRadians(result));
                    break;
                case "c":
                    result = Math.cos(Math.toRadians(result));
                    break;
                case "^":
                    result = Math.pow(result, operand);
                    break;
                default:
                    throw new IllegalArgumentException("Invalid operator!");
            }
        }

        return result;
    }

    // 计算阶乘
    private static long factorial(int n) {
        if (n < 0) {
            throw new IllegalArgumentException("Negative number!");
        }
        long result = 1;
        for (int i = 2; i <= n; i++) {
            result *= i;
        }
        return result;
    }

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

该示例中，将输入的表达式字符串按运算符和数字分割成一个字符串数组，然后按顺序计算每个操作数与运算符之间的结果，并根据运算符进行相应的计算。另外，阶乘、正弦、余弦和指数等函数的计算使用了Java Math库中的函数。