Java 爪哇石剪刀

查看了另一个线程，但我无法理解为什么我的程序在输入我的选择（即Rock）后会给出2个答案，或者根本没有答案。我知道这和之前的帖子很相似，但我不明白为什么回复会有所不同。任何帮助都将不胜感激

import java.util.Random;
import java.util.Scanner;

public class RockPaperScissors {

public static void main(String[] args) {
System.out.println("Do you want to play Rock Paper Sissors?");
System.out.println("Yes or No?");
Scanner scan = new Scanner(System.in);
String input = scan.nextLine();             
if (input.equals("Yes")){
    System.out.println("OK pick your weapon!");
    String weapon = scan.nextLine();
    Random rand = new Random();
    rand.nextInt(3);
    if (rand.nextInt(3) == 0){
    //*0=Rock
        if (weapon.equals("Rock")) {
            System.out.println("I choose Rock, so did you... tie.");                    
        }
        else if (weapon.equals("Paper")){
            System.out.println("I choose Rock and you choose Paper...You Win :( !");
        }
        else if (weapon.equals("Scissors")){
            System.out.println("I choose Rock and you choose Paper...You Lose :) !");
        }               
    }
    if (rand.nextInt(3) == 1){
    //*1=Paper
        if (weapon.equals("Rock")) {
            System.out.println("I choose Paper and you choose Rock...You Lose :)  !");                  
        }
        else if (weapon.equals("Paper")){
            System.out.println("I choose Paper, so did you...tie.");
        }
        else if (weapon.equals("Scissors")){
            System.out.println("I choose Paper and you choose Scissors...You Win :(      !");
        }               
    }
    if (rand.nextInt(3) == 2){
        //*2=Scissors
            if (weapon.equals("Rock")) {
                System.out.println("I choose Scissors and you choose Rock...You Win :(    !");                    
            }
            else if (weapon.equals("Paper")){
                System.out.println("I choose Scissors and you choose Paper...You Lose:) !");
            }
            else if (weapon.equals("Scissors")){
                System.out.println("I choose Scissors, so did you...tie.");
            }               
        }
    }
else {
    System.out.println("OK have a nice day.");
}
}

}

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感谢您的帮助。

您有三条if语句，每条语句都生成自己的随机值，因此可以执行所有三条if语句。您应该保存rand.nextInt（3）的结果一次，并在三个连续的if语句中使用该结果。我将把一行中的三个if语句也更改为一系列if/elseif语句

你打电话的地方似乎几乎找到了正确的解决方案

rand.nextInt(3);

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在初始if语句之前，只需将结果保存到一个变量。

您知道什么是调试器了吗？试着拿些笔和纸，画出程序的执行情况。