Java-为什么不起作用？

Question

This is just a simple rock paper scissors game I made with eclipse as a test and I already put one through this website earlier and got some answers but now I've run into a problem where I cannot find a winner?

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

Change your initial declaration of computerChose (before your while ) to String computerChose = ""; and remove the line that reads computerChose = new String(); (after your switch ).

Answer 2

After the while statement, computerChose is getting reset using computerChose = newString() . Hence, none of the conditions being tested in the if statements are equating to true.

Answer 3

Tested and works

Initialize computerChose right away, so change
String computerChose; to String computerChose = "";

and take away the line computerChose = new String(); because it's setting the computerChoose String to an empty String after you initialized it in your switch cases.