java實(shí)現(xiàn)計(jì)算器代碼怎么寫(xiě)

以下是一個(gè)簡(jiǎn)單的Java計(jì)算器代碼示例：

import java.util.Scanner;

public class Calculator {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        System.out.println("Enter the first number: ");
        double num1 = scanner.nextDouble();
        
        System.out.println("Enter the second number: ");
        double num2 = scanner.nextDouble();
        
        System.out.println("Enter the operation (+, -, *, /): ");
        char operation = scanner.next().charAt(0);
        
        double result = 0;
        
        switch(operation) {
            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 operation.");
        }
        
        System.out.println("Result: " + result);
        
        scanner.close();
    }
}

此代碼通過(guò)用戶輸入兩個(gè)數(shù)和運(yùn)算符，然后根據(jù)運(yùn)算符執(zhí)行相應(yīng)的運(yùn)算，最終輸出結(jié)果。您可以根據(jù)自己的需求對(duì)此代碼進(jìn)行修改和擴(kuò)展。