java制作一个计算器

好的，以下是一个简单的 Java 计算器示例代码：

import java.util.Scanner;

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

        System.out.print("Enter first number: ");
        num1 = scanner.nextDouble();

        System.out.print("Enter second number: ");
        num2 = scanner.nextDouble();

        System.out.print("Enter operator (+, -, *, /): ");
        operator = scanner.next().charAt(0);

        switch (operator) {
            case '+':
                result = num1 + num2;
                break;
            case '-':
                result = num1 - num2;
                break;
            case '*':
                result = num1 * num2;
                break;
            case '/':
                result = num1 / num2;
                break;
            default:
                System.out.println("Invalid operator");
                return;
        }

        System.out.println(num1 + " " + operator + " " + num2 + " = " + result);
    }
}

运行程序后，根据提示输入两个数字和操作符，计算器将输出结果。注意，此示例代码未处理输入错误的情况，例如输入非数字或不支持的操作符。