Question

这只是一个简单的石头剪刀游戏我用eclipse作为测试，我已经通过这个网站提前一个并得到了一些答案，但现在我遇到了一个我找不到胜利者的问题？

package rockPaperScissors;

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

public class RockPaperScissors {

    public static void main(String args[]) {
        String playerChose;
        String computerChose;
        while(true) {
            System.out.println("Welcome to rock paper scissors!");
            System.out.println("Please enter \"rock\", \"paper\", or \"scissors\"");
            Scanner playerChoice = new Scanner (System.in);
            playerChose = playerChoice.nextLine();
            Random computerChoice = new Random();
            int computer = computerChoice.nextInt(3) + 1;

            switch (computer) {
            case 1:
                computerChose = "rock";
                System.out.println("Computer chose rock!");
                break;
            case 2:
                computerChose = "paper";
                System.out.println("Computer chose paper!");
                break;
            case 3:
                computerChose = "scissors";
                System.out.println("Computer chose scissors!");
            }

            computerChose = new String();

            if (playerChose.equals("rock") && computerChose.equals("scissors") || playerChose.equals("paper") && computerChose.equals("rock") || playerChose.equals("scissors") && computerChose.equals("paper")) {
                System.out.println("Player won!");
            }
            if(playerChose.equals(computerChose)) {
                System.out.println("Game tied!");
            }
            if(computerChose.equals("rock") && playerChose.equals("scissors") || computerChose.equals("paper") && playerChose.equals("rock") || computerChose.equals("scissors") && computerChose.equals("paper")) {
                System.out.println("Computer won!");
            }
        }
    }
}

Answer 1

将computerChose的初始声明（在while之前）更改为String computerChose = "";，并删除标有computerChose = new String();的行（在switch之后）。< / p>

Answer 2

在while语句后，使用computerChose = newString()重置computerChose。因此，if语句中测试的条件都不等于true。

Answer 3

经过测试并正常工作

立即初始化computerChose，进行更改
String computerChose;至String computerChose = "";

并删除行computerChose = new String();，因为它在您的切换案例中初始化后将computerChoose字符串设置为空字符串。

Java - 为什么这不起作用？

3 个答案: