Java 一个对象如何从另一个类中创建的对象调用方法

我是Java新手（一般来说也是编程新手），我正试图编写一个可以玩围棋的程序，但是我很难让一个对象调用另一个对象的方法。它还没有完成，但这是我到目前为止所做的。 这将被调用以开始游戏：

public class StartGame {

public static void start(){
    Deck deck = new Deck(1);
    GoFishHumanPlayer player = new GoFishHumanPlayer();
    GoFishAiPlayer ai = new GoFishAiPlayer();
    player.drawHand();
    ai.drawHand();
    player.turn();
}
}

用作游戏牌组的对象

import java.util.Random;

public class Deck {

private int[] card = new int[14];
private int size;

Random r = new Random();

public Deck(int x){
    size = x;
    card[0] = 4 * size * 13;
    card[1] = 4 * size;
    card[2] = 4 * size;
    card[3] = 4 * size;
    card[4] = 4 * size;
    card[5] = 4 * size;
    card[6] = 4 * size;
    card[7] = 4 * size;
    card[8] = 4 * size;
    card[9] = 4 * size;
    card[10] = 4 * size;
    card[11] = 4 * size;
    card[12] = 4 * size;
    card[13] = 4 * size;}

public int draw(){
    int x = r.nextInt(card[0]) + 1;
    int y = 1;
    while(x>card[y]){
        x -=card[y];
        y++;}
    card[y]--;
    card[0]--;
    return y;}

}

下一个类将由GoFishHumanPlayer和GoFishAiPlayer扩展。这些对象将代表玩家

public class GoFishPlayer {

private int[] hand = new  int[14];
private int pairs;

public void drawHand(){
    for(int x = 0; x < 5; x++){
        int y = deck.draw();//Here's where I get an error "deck cannot be resolved"
        hand[y]++;}
}
}

公共类GoFishPlayer{
私有整数[]手=新整数[14]；
私有整数对；
公营部门{
对于（int x=0；x<5；x++）{
int y=deck.draw（）；//在这里我得到一个错误“deck无法解析”
手[y]++；}
}
}

---

在GoFishPlayer的第8行，我的IDE显示“无法解析甲板”。回到StartGame，我创建了一个名为deck的对象，但如何使所有类都可以访问它。

无需使所有类都可以访问它，只需在

GoFishPlayer的构造函数中传递一个引用即可：

public class GoFishPlayer {
  private Deck deck;

  public GoFishPlayer(Deck deck) { this.deck = deck; }
  ...
}

public class StartGame {
  public static void start(){
    Deck deck = new Deck(1);
    GoFishHumanPlayer player = new GoFishHumanPlayer(deck);
    GoFishAiPlayer ai = new GoFishAiPlayer(deck);
    player.drawHand();
    ai.drawHand();
    player.turn();
  }
}

无需使所有类都可以访问它，只需在
GoFishPlayer的构造函数中传递一个引用即可：

public class GoFishPlayer {
  private Deck deck;

  public GoFishPlayer(Deck deck) { this.deck = deck; }
  ...
}

public class StartGame {
  public static void start(){
    Deck deck = new Deck(1);
    GoFishHumanPlayer player = new GoFishHumanPlayer(deck);
    GoFishAiPlayer ai = new GoFishAiPlayer(deck);
    player.drawHand();
    ai.drawHand();
    player.turn();
  }
}

如果需要所有类都可以访问它，只需将其传递给构造函数即可

public class GoFishPlayer {
private Deck deck;

public GoFishPlayer(Deck deck) { this.deck = deck; }
...
}

如果需要所有类都可以访问它，只需将其传递给构造函数即可

public class GoFishPlayer {
private Deck deck;

public GoFishPlayer(Deck deck) { this.deck = deck; }
...
}

您必须为玩家实例提供对
牌组
实例的引用。为什么您不能在GoFishPlayer类中创建牌组对象您必须为玩家实例提供对
牌组
实例的引用。为什么您不能在GoFishPlayer类中创建牌组对象