用java语言写一个简易计算器并增添一些新功能并且写出文件名

好的，我可以帮你完成这个任务。以下是一个用 Java 语言编写的简易计算器的示例代码，我增加了一些新的功能，如求平方根、求余数、以及加入了一个记忆功能，可以将计算结果存储到文件中。

import java.util.Scanner;
import java.io.*;

public class Calculator {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        double num1, num2, result;
        String operator;
        boolean isMemory = false;
        String memoryFileName = "memory.txt";

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

            if (isMemory) {
                System.out.print("Would you like to use the number in memory? (Y/N): ");
                String useMemory = input.next().toUpperCase();

                if (useMemory.equals("Y")) {
                    num1 = readMemory(memoryFileName);
                } else {
                    isMemory = false;
                }
            }

            System.out.print("Enter the operator (+, -, *, /, %, sqrt): ");
            operator = input.next();

            if (operator.equals("sqrt")) {
                result = Math.sqrt(num1);
            } else {
                System.out.print("Enter the second number: ");
                num2 = input.nextDouble();

                switch (operator) {
                    case "+":
                        result = num1 + num2;
                        break;
                    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!");
                        continue;
                }
            }

            System.out.println("Result: " + result);
            System.out.print("Would you like to save the result to memory? (Y/N): ");
            String saveMemory = input.next().toUpperCase();

            if (saveMemory.equals("Y")) {
                writeMemory(memoryFileName, result);
                isMemory = true;
            }

            System.out.print("Would you like to perform another calculation? (Y/N): ");
            String continueCalculation = input.next().toUpperCase();

            if (continueCalculation.equals("N")) {
                break;
            }
        }
    }

    public static void writeMemory(String fileName, double result) {
        try {
            FileWriter writer = new FileWriter(fileName);
            writer.write(Double.toString(result));
            writer.close();
        } catch (IOException e) {
            System.out.println("An error occurred.");
            e.printStackTrace();
        }
    }

    public static double readMemory(String fileName) {
        try {
            File file = new File(fileName);
            Scanner reader = new Scanner(file);
            double memory = reader.nextDouble();
            reader.close();
            return memory;
        } catch (FileNotFoundException e) {
            System.out.println("Memory file not found.");
            return 0;
        }
    }
}

你可以将此代码保存为 `Calculator.java` 文件。