用java写一个计算器的代码

很高兴回答您的问题。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 scanner = new Scanner(System.in);
System.out.print("请输入第一个数字: ");
double num1 = scanner.nextDouble();
System.out.print("请输入第二个数字: ");
double num2 = scanner.nextDouble();
System.out.print("请选择操作符 (+, -, *, /): ");
char operator = scanner.next().charAt();
double result;
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("错误的操作符");
return;
}
System.out.println(num1 + " " + operator + " " + num2 + " = " + result);
}
}

希望这个代码示例能够帮助您。