java - 如何将随机数添加到 java(blackjack) 的总数中？

Question

这是我的代码:

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

public class Assignment2 {
    public static void main(String args[]){ 
        Scanner stdin = new Scanner(System.in);

        Random random = new Random();     
        int ran2 = (random.nextInt(10));
        int ran1 = (random.nextInt(10));
        int total = ran1 + ran2;
        char exit = 'y';

        System.out.println("First cards: " + ran1 + ", " + ran2);
        System.out.println("Total: " + total);

        while(exit != 'n' && total < 21){
            System.out.println("Do you want another card? (y/n): ");
            exit = stdin.next().charAt(0);


            System.out.println("Card: "+ (random.nextInt(10)));
            total = total + (random.nextInt(10));
            System.out.println("Total: "+ total);


        }   

    }       
}

当我输入n时，如何才能让程序退出，而不是再次打印出总数？

Answer 1

看看这个:

public class Assignment2 {
    public static void main(String args[]){ 
        int next = 0;
        Scanner stdin = new Scanner(System.in);

        Random random = new Random();     
        int ran2 = (random.nextInt(10));
        int ran1 = (random.nextInt(10));
        int total = ran1 + ran2;
        char exit = 'y';

        System.out.println("First cards: " + ran1 + ", " + ran2);
        System.out.println("Total: " + total);

        while(exit != 'n' && total < 21){
            System.out.println("Do you want another card? (y/n): ");
            exit = stdin.next().charAt(0);

            next = random.nextInt(10);
            System.out.println("Card: "+ next);
            total = total + next;
            System.out.println("Total: "+ total);


        }   
        if (exit.equals('n'))
            system.exit(0);

    }
}

• 现在，通过调用 system.exit(0) 输入 n 后，程序就存在了.
• 您只需调用 nextInt 一次，这样就不会创建 2 个不同的随机数。因此，我将第一个调用放入变量 next 中，以便您可以随意使用它，而无需再次调用 nextInt。
• 如果您希望程序在用户输入 n 后立即退出，您需要将 if 语句放在 exit = stdin.next().charAt(0);