java计算器代码发一组

我可以为你提供一个简单的Java控制台版计算器代码示例。这个例子是一个基本的加减乘除功能的实现：

import java.util.Scanner;

class Calculator {
    // 定义运算方法
    public static int add(int a, int b) {
        return a + b;
    }

    public static int subtract(int a, int b) {
        return a - b;
    }

    public static int multiply(int a, int b) {
        return a * b;
    }

    public static int divide(int a, int b) {
        if (b != 0) {
            return a / b;
        } else {
            throw new IllegalArgumentException("Division by zero is not allowed.");
        }
    }
}

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter operation (add, subtract, multiply, divide):");
        String operation = scanner.next();

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

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

        try {
            switch (operation.toLowerCase()) {
                case "add":
                    System.out.println("Result: " + Calculator.add(num1, num2));
                    break;
                case "subtract":
                    System.out.println("Result: " + Calculator.subtract(num1, num2));
                    break;
                case "multiply":
                    System.out.println("Result: " + Calculator.multiply(num1, num2));
                    break;
                case "divide":
                    System.out.println("Result: " + Calculator.divide(num1, num2));
                    break;
                default:
                    System.out.println("Invalid operation. Please choose from add, subtract, multiply, divide.");
            }
        } catch (IllegalArgumentException e) {
            System.out.println(e.getMessage());
        }

        scanner.close();
    }
}