设置我的Hangman方法并在主方法中调用它们

Question

难以将Game类中的方法调用到hangman游戏的主方法中。我们应该旋转转盘获得100,250或500美元的累积奖金，然后按照您的期望玩游戏……但是方法是必要的。我还没有完成，我只是想能够调用我的方法，在这一点上，看看它是如何工作的。下面是我的代码:

import java.util.Scanner;
import java.util.Random;
public class GameDemo {
    public static void main(String[] args) {
        String[] songs = {"asdnj", "satisfaction", "mr jones",
        "uptown funk"}; //note this is a very short list as an example 
        Random rand = new Random();
        int i = rand.nextInt(songs.length);
        String secretword = songs[i];
        System.out.print("Welcome to The Guessing Game. The topic is song      titles. nYou have 6 guesses. Your puzzle has the following letters: ");
        System.out.print("After spinning the wheel, you got " + spinWheel());
        //continue the code here.
    }
}
class Game {
    Random rand = new Random();
    String[] songs = {"asdnj", "satisfaction", "mr jones",
    "uptown funk"};
    int i = rand.nextInt(songs.length);
    private String secretword = songs[i];
    private char [] charSongs = secretword.toCharArray();
    private char [] guessed = new char [charSongs.length];
    private int guesses;
    private int misses; 
    private char letter;
    private char [] jackpotAmount = {100,250,500};
    public Game (){}
    public int spinWheel(int[] jackpotAmount){
      int rand = new Random().nextInt(jackpotAmount.length);
      return jackpotAmount[rand];
    }
    public char guessLetter(char charSongs [], char letter){
        int timesFound = 0;
        for (int i = 0; i < charSongs.length; i++){
           if (charSongs[i] == letter){
             timesFound++;
             guessed[i] = letter;
           }
        }
        return letter;
    }
}

返回错误是

GameDemo.java:11:错误:找不到符号System.out.print("After旋转轮子，你得到" + spinWheel());^

Answer 1

要从另一个类调用方法，您需要使方法public。一旦完成，如果您将多次调用相同的方法并且每次都希望它执行相同的功能(参数仍然可以不同)，则将它们设置为static。

要调用方法，请执行以下操作(这是大多数类和方法的通用形式，您应该能够使用它来调用所有方法):

yourClassWithMethod.methodName();

Answer 2

有几个问题在你的spinWheel方法调用:

你还没有实例化任何Game对象来调用这个方法。要么你必须让它成为static，要么只是实例化一个Game，然后从那个对象调用它。我个人更喜欢第二种(非静态)选项，因为，特别是因为静态方法不能直接访问非静态方法或变量(…你需要一个实例或使他们(static)。

在main中，您可以这样做(非静态解决方案):

Game game = new Game();
System.out.print("After spinning the wheel, you got " + game.spinWheel());

spinWheel需要int[]类型的参数。这似乎是没有用的，因为有一个实例变量jackpotAmount似乎是为此目的而创建的。jackpotAmount(参见第二点)在您的示例中应该是静态的。

spinWheel变为:

//you can have "public static int spinWheel(){" 
//if you chose the static solution
//Note that jackpotAmount should also be static in that case
public int spinWheel(){
    int rand = new Random().nextInt(jackpotAmount.length);
    return jackpotAmount[rand];
}

注意jackpotAmount最好是int[]而不是char[]