调用空方法

发布于 2024-10-14 07:34:36 字数 864 浏览 1 评论 0原文

我需要在调用另一个方法之前调用 void 方法。

我有这个方法

    public void shuffle() {
    various = new Random();

    currentCard = 0;
    currentTotal1 = 0;
    currentTotal2 = 0;

    for (int first = 0; first < deckOfCards.length; first++) {
        int second = various.nextInt(number_cards);

        Card temp = deckOfCards[first];
        deckOfCards[first] = deckOfCards[second];
        deckOfCards[second] = temp;
    }
}

，在另一个类中我有：

public class GameRules {
final deck myDeckOfCards = new deck();
myDeckOfCards.shuffle(); //error here

// first
public ImageIcon GameRules1() {
    return myDeckOfCards.giveCardPlayer1().getImage();
}

基本问题是我需要在展示牌之前在牌堆中进行洗牌。如果没有洗牌方法，纸牌的顺序是连续的

你知道吗？如果我将该方法放在 public ImageIcon GameRules1() 中不会给出错误，但我需要在游戏前洗牌所有卡片，而不是在每个给出卡片方法之前洗牌。

谢谢

原文

I need to invoke a void method before call another method.

I have this method

    public void shuffle() {
    various = new Random();

    currentCard = 0;
    currentTotal1 = 0;
    currentTotal2 = 0;

    for (int first = 0; first < deckOfCards.length; first++) {
        int second = various.nextInt(number_cards);

        Card temp = deckOfCards[first];
        deckOfCards[first] = deckOfCards[second];
        deckOfCards[second] = temp;
    }
}

And in another class I have:

public class GameRules {
final deck myDeckOfCards = new deck();
myDeckOfCards.shuffle(); //error here

// first
public ImageIcon GameRules1() {
    return myDeckOfCards.giveCardPlayer1().getImage();
}

The basic problem is that I need to do shuffle in the deck of cards before show a card. Without shuffle method the order of cards is sequential

Any idea? If I put the method inside public ImageIcon GameRules1() doesn't give error, but I need shuffle all cards before game, no before each give card method.

thanks

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小糖芽 2024-10-21 07:34:36

您应该将该调用放在类的构造函数内：

public GameRules() {
    myDeckOfCards.shuffle();
}

构造函数是您为对象执行初始化任务的地方。

另外，您确实不应该有一个名为 GameRules() 的方法来返回 ImageIcon。您应该重命名该方法 getImage 或类似的名称。然后，当您使用构造函数创建一个 GameRules 并对其调用 getImage 时，牌组将被洗牌。

示例：

GameRules gr = new GameRules(); // deck gets shuffled in constructor call
JLabel test2 = new JLabel(gr.getImage());

查看 Java 教程，了解有关为类编写构造函数的良好教程.

You should place that call inside your constructor for the class:

public GameRules() {
    myDeckOfCards.shuffle();
}

The constructor is the place where you do initialization tasks for your objects.

Also, you really shouldn't have a method called GameRules() that returns an ImageIcon. You should rename that method getImage or something like that. Then, when you create a GameRules with the consturctor and call getImage on it, the deck will be shuffled.

Example:

GameRules gr = new GameRules(); // deck gets shuffled in constructor call
JLabel test2 = new JLabel(gr.getImage());

Check out the Java tutorials for a good tutorial on writing constructors for your classes.

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黑白记忆 2024-10-21 07:34:36

要么按照建议使用构造函数，或者，如果在某些时候您有多个构造函数，您可能希望将它们通用的代码移至初始值设定项：

public class GameRules {
final deck myDeckOfCards = new deck();

// instance initalizer
{
  myDeckOfCards.shuffle(); // no more error
}

但是，正如注释中指出的，使用构造函数更好，链接如果需要的话构造函数。事实证明，实例初始值设定项最适合在匿名类中使用。

Either use a constructor as suggested, or, if at some point you have multiple constructors, you may wish to move the code that is common to them to an initializer:

public class GameRules {
final deck myDeckOfCards = new deck();

// instance initalizer
{
  myDeckOfCards.shuffle(); // no more error
}

But, as pointed out in the comments, using a constructor is better, chaining constructors if necessary. It turns out that instance initializers are best used in anonymous classes.

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