如何实现双击JAR文件时自动打开Windows命令提示符运行程序

我是一名Java新手，有一周Java开发经验和三周C#开发经验，正在做第一个基础项目——一个靠IntelliJ运行、终端交互的简易计算器。已经把项目导出成JAR文件，现在需要通过Windows命令提示符打开运行。我希望双击这个JAR文件时，能自动打开命令提示符并运行程序，而且只能依赖单个JAR文件，不能用额外的批处理文件之类的。之前搜过相关问题，但找到的方案要么没用，要么需要多个文件，试过的搜索关键词包括“How to open non java files with java”“How to open external files with java”“How to run Windows Command prompt with java”，也看了YouTube和其他相关问题，都没找到可行的办法。

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        // Make it automatically open Command prompt
        float[] inputVariables = new float[4];
        calculator(inputVariables);
    }
    public static void calculator(float[] loopVariables) {

        System.out.println("WARNING: Inputting a non true or false value, or a non number when asked to will crash the program! (For now)");

        Scanner inputScanner = new Scanner(System.in);

        while (true) {
            float z = 0;
            System.out.println("Select an operation: (Addition: +, Subtraction: -, Multiplication: *, Division: /, Modulo: %, Power: ^, Absolute Value: |, Round: ~");
            String operation = inputScanner.next();
            switch (operation) {
                case "+", "-", "*", "/", "%", "^", "|", "~" -> {

                }
                default -> {
                    System.out.println("This is not a valid operation.");
                    continue;
                }
            }

            float x;
            if (loopVariables[1] == 0) {
                System.out.println("Input x:");
                x = inputScanner.nextFloat();
            } else {
                x = loopVariables[0];
                System.out.println("x = " + x);
            }

            float y = 0;
            switch (operation) {
                case "+", "-", "*", "/", "%", "^" -> {
                    System.out.println("Input y:");
                    y = inputScanner.nextFloat();
                }
                case "~" -> {
                    System.out.println("Round up, down or auto: (+ or -)");
                    operation = inputScanner.next();
                    switch (operation) {
                        case "+" -> {
                            System.out.println("+~" + x + " = " + (Math.ceil(x)));
                            z = (float)Math.ceil(x);
                            operation = "~";
                        }
                        case "-" -> {
                            System.out.println("-~" + x + " = " + (Math.floor(x)));
                            z = (float)(Math.floor(x));
                            operation = "~";
                        }
                        default -> {
                            System.out.println("This is not a valid operation.");
                            continue;
                        }
                    }
                }
                case "|" -> {
                }
            }
            switch (operation) {
                case "+" -> {
                    System.out.println(x + " + " + y + " = " + (x + y));
                    z = x + y;
                }
                case "-" -> {
                    System.out.println(x + " - " + y + " = " + (x - y));
                    z = x - y;
                }
                case "*" -> {
                    System.out.println(x + " * " + y + " = " + (x * y));
                    z = x * y;
                }
                case "/" -> {
                    System.out.println(x + " / " + y + " = " + (x / y));
                    z = x / y;
                }
                case "%" -> {
                    System.out.println(x + " % " + y + " = " + (x % y));
                    z = x % y;
                }
                case "^" -> {
                    System.out.println(x + "^" + y + " = " + (float)(Math.pow(x, y)));
                    z = (float)Math.pow(x, y);
                }
                case "|" -> {
                    System.out.println("|" + x + "| = " + (Math.abs(x)));
                    z = Math.abs(x);
                }
                case "~" -> {

                }
                default -> {
                    System.out.println("This is not a valid operation.");
                    continue;
                }
            }
            System.out.println("Would you like to continue with the result as x? (true or false)");
            boolean finish = inputScanner.nextBoolean();
            float hasLooped;
            if (finish) {
                hasLooped = 1;
                loopVariables[0] = z;
                loopVariables[1] = hasLooped;
                continue;
            } else {
                System.out.println("Would you like to continue without the result as x? (true or false)");
                finish = inputScanner.nextBoolean();
            }
            hasLooped = 0;
            loopVariables[1] = hasLooped;
            if (!finish) {
                System.out.println("Ending Calculator.");
                break;
            }
        }
    }
}

内容的提问来源于stack exchange，提问作者Zadezapper