用Java写一段计算器的代码

好的，以下是Java编写的计算器代码：

import java.util.Scanner;

public class Calculator {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);

System.out.print("请输入一个数：");
double num1 = input.nextDouble();

System.out.print("请输入运算符：");
char operator = input.next().charAt(0);

System.out.print("请输入另一个数：");
double num2 = input.nextDouble();

double result = 0.0;

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("错误的运算符！");
}

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

希望对你有帮助！