用java语言编写一个简易计算器并在终端编译

好的，以下是一个简单的Java计算器代码示例：

import java.util.Scanner;

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

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

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

        System.out.print("Enter operator (+, -, *, /): ");
        operator = input.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);
    }
}

将上述代码保存为Calculator.java文件，打开命令行终端，进入文件所在目录，执行以下命令进行编译：

javac Calculator.java

编译成功后，在终端中输入以下命令运行程序：

java Calculator

程序会提示您输入两个数字和运算符，之后输出计算结果。