Question

开始我还是新手编程。我的任务是制作一个没有阵列的石头剪刀程序。根据我们以前的选择，程序将选择相应的武器。在程序结束时，如果用户不想继续，我们将显示他们的总分。所有这些都应该是我们在main中调用的另一种方法。

正如我之前所说，我对编程非常陌生，所以在数组之外，if else语句是我知道如何做到这一点的唯一方法（以及很多em）。

import java.util.Scanner;

public class ASSIGNMENT
{
  public static void main (String [] args)
  { 
     game();

  }//end main

  public static void game ()
  {
     Scanner kb = new Scanner(System.in);

     //assigning variables
     int rock = 1; 
     int scissors = 2; 
     int paper = 3; 
     int weaponAI = 0;
     int weaponP = 0;
     int wins = 0;
     int losses = 0;
     int ties = 0;
     int rockNum = 0;
     int scissorsNum = 0;
     int paperNum = 0;
     String yorn;

     do
     {
        //generate random numbe to decide weapon
        double weaponNum = (Math.random() * 3)+ 1;
        System.out.println(weaponNum);
        if (weaponNum >= 1 && weaponNum < 2)
        {  
           if (rockNum > scissorsNum && rockNum > paperNum)
              weaponAI = paper;
           else if (paperNum > scissorsNum && paperNum > rockNum)
              weaponAI = scissors;
           else
              weaponAI = rock;
        }
        else if (weaponNum >= 2 && weaponNum < 3)
        {
           if (scissorsNum > rockNum && scissorsNum > paperNum)
              weaponAI = rock;
           else if (paperNum > scissorsNum && paperNum > rockNum)
              weaponAI = scissors;
           else
              weaponAI = paper;
        }
        else if (weaponNum >= 3)
        {
           if (scissorsNum > rockNum && scissorsNum > paperNum)
              weaponAI = rock;
           else if (rockNum > scissorsNum && rockNum > paperNum)
              weaponAI = paper;
           else
              weaponAI = scissors;
        }
        //prompting for guess and assigning
        System.out.println("BATTLE START!");
        System.out.println("Choose your weapon: ");
        String weaponStr = kb.nextLine();
        if (weaponStr == "Rock" || weaponStr == "rock")
        {
           weaponP = rock;
           ++rockNum;
        }
        else if (weaponStr == "Scissors" || weaponStr == "scissors")
        {
           weaponP = scissors;
           ++scissorsNum;
        }
        else if (weaponStr == "Paper" || weaponStr == "paper")   
        {
           weaponP = paper;
           ++paperNum;
        }
        else if (weaponStr =="quit" || weaponStr == "Quit")
           System.exit(-1);

        //comparing AI and Players weapon
        //tied
        if (weaponAI == rock && weaponP == rock)
        {
           System.out.println("You both chose rock");
           ++ties;
        }
        else if (weaponAI == paper && weaponP == paper)
        {
           System.out.println("You both chose paper");
           ++ties;
        }   
        else if (weaponAI == scissors && weaponP == scissors)
        {
           ++ties;
           System.out.println("You both chose scissors");
        }
        //AI wins
        else if (weaponAI == rock && weaponP == scissors)
        {
           ++losses;
           System.out.println("AI wins");
        }
        else if (weaponAI == paper && weaponP == rock)
        {
           ++losses;
           System.out.println("AI wins");
        }
        else if (weaponAI == scissors && weaponP == paper)
        {
           ++losses;
           System.out.println("AI wins");
        }
        //Player wins
        else if (weaponAI == scissors && weaponP == rock)
        {
           ++wins;
           System.out.println("You win!");
        }
        else if (weaponAI == rock && weaponP == paper)
        {
           ++wins;
           System.out.println("You win!");
        }
        else if (weaponAI == paper && weaponP == scissors)
        {
           ++wins;
           System.out.println("You win!");
        }
        //prompting user to play again
        System.out.println("Would you like to play again? Y or N?");
        yorn = kb.nextLine();

     }//end do
     while (yorn == "y" || yorn == "Y" || yorn == "Yes" || yorn == "yes");

     //Displaying scores
     System.out.println("Game over.");
     System.out.println("You had " + wins + " wins.");
     System.out.println("You had " + losses + " losses.");
     System.out.println("You had " + ties + " ties.");
     System.out.println("You chose rock " + rockNum + " times.");
     System.out.println("You chose paper " + paperNum + " times.");
     System.out.println("You chose scissors " + scissorsNum + " times.");

  }//end game
}//end class

我不确定为什么输入＆＃34; rock＆＃34;和＆＃34; y＆＃34;

1.5102368482522261

BATTLE START！

选择你的武器：

岩石
     你想再玩一次吗？是或否？

ý

游戏结束。

你有0胜。

你有0输。

你有0个关系。

你选择摇滚0次。

您选择纸张0次。

你选择剪刀0次。

这几乎就像程序忽略了我的所有if else语句。我确信这很简单，我不理解......

Answer 1

为了比较String内容，您必须将==替换为equalsIgnoreCase()。

您无法将两个字符串内容与==运算符进行比较。 java中的==运算符比较String references （如果一个Object是另一个Object）

要使代码正常工作，您需要以下内容：

if (weaponStr.equalsIgnoreCase("Rock")){
  ...
}

要了解如何在Java中完成String比较，您还可以看到：

为什么我的程序没有显示正确的输出？

1 个答案: