请使用JAVA语言设计一个科学计算器

好的，下面是一个基本的Java科学计算器的实现示例：

import java.util.Scanner;

public class ScientificCalculator {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double num1, num2, result = 0.0;
        char operator;

        System.out.println("欢迎使用科学计算器！");

        System.out.print("请输入第一个数字: ");
        num1 = scanner.nextDouble();

        System.out.print("请选择运算符 (+, -, *, /, %, ^, !, sin, cos, tan, log, ln, sqrt, abs): ");
        operator = scanner.next().charAt(0);

        switch (operator) {
            case '+':
                System.out.print("请输入第二个数字: ");
                num2 = scanner.nextDouble();
                result = num1 + num2;
                break;
            case '-':
                System.out.print("请输入第二个数字: ");
                num2 = scanner.nextDouble();
                result = num1 - num2;
                break;
            case '*':
                System.out.print("请输入第二个数字: ");
                num2 = scanner.nextDouble();
                result = num1 * num2;
                break;
            case '/':
                System.out.print("请输入第二个数字: ");
                num2 = scanner.nextDouble();
                if (num2 == 0) {
                    System.out.println("错误：除数不能为0");
                    return;
                } else {
                    result = num1 / num2;
                }
                break;
            case '%':
                System.out.print("请输入第二个数字: ");
                num2 = scanner.nextDouble();
                result = num1 % num2;
                break;
            case '^':
                System.out.print("请输入次方数: ");
                num2 = scanner.nextDouble();
                result = Math.pow(num1, num2);
                break;
            case '!':
                result = factorial(num1);
                break;
            case 's':
                result = Math.sin(num1);
                break;
            case 'c':
                result = Math.cos(num1);
                break;
            case 't':
                result = Math.tan(num1);
                break;
            case 'l':
                if (scanner.next().charAt(1) == 'o') {
                    result = Math.log10(num1);
                } else {
                    result = Math.log(num1);
                }
                break;
            case 's':
                result = Math.sqrt(num1);
                break;
            case 'a':
                result = Math.abs(num1);
                break;
            default:
                System.out.println("错误：无效的运算符");
                return;
        }

        System.out.println(num1 + " " + operator + " = " + result);
    }

    public static double factorial(double n) {
        if (n <= 1) {
            return 1;
        } else {
            return n * factorial(n - 1);
        }
    }
}

这个程序实现了基本的加减乘除取余、次方、阶乘、三角函数、对数、根号、绝对值等科学计算功能。用户输入数字和运算符后，程序通过 switch 语句计算结果并输出。