java - "cannot find symbol: variable input"错误

Question

这是我遇到问题的代码:

import java.util.*;
public class Game {
public static final int ROCK = 1;
public static final int PAPER = 2;
public static final int SCISSORS = 3;

public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    String name = intro();
    int numRounds = numRounds(name);
    game(name, numRounds);
}

public static String intro() {
    System.out.println("Welcome to Rock Paper Scissors. I, the computer, will be your opponent.");
    System.out.print("Please type in your name and press return: ");
    String name = input.nextLine();
    return name;
}

public static int numRounds(String name) {
    System.out.println("Welcome " + name + ".");
    System.out.println("All right " + name + ". How many games would you like to play?");
    System.out.print("Enter the number of rounds you want to play and press return: ");
    int numRounds = input.nextInt();
    return numRounds;
}

当我使用扫描仪获取用户姓名和他们想要玩的轮数的值时，我收到错误。我只想返回这些值以在主函数中使用。

如有任何帮助，我们将不胜感激。

Answer 1

在您想要的两个方法中没有 input 变量 - 将其作为方法参数传递:

public static String intro(Scanner input) { .. }
public static int numRounds(String name, Scanner input) { .. }

...

String name = intro(input);
int numRounds = numRounds(name, input);

除此之外，没有 game() 方法 - 定义它。