将变量传递给事件调度线程

发布于 2024-07-17 07:37:05 字数 393 浏览 9 评论 0原文

我的 GUI 锁定，因为我需要通过 EDT 更新它，但是，我还需要传递一个正在使用 GUI 更新的变量：

while ((message = this.in.readLine()).startsWith("NUMPLAYERS"))
{
    numOfPlayers = Integer.parseInt(message.split(":")[1]);
    numPlayers.setText("There are currently " + numOfPlayers + " players in this game");
}

这不起作用。我需要在 EDT 中设置文本，但我无法将 numOfPlayers 传递给它而不将其声明为最终的（我不想这样做，因为它随着新玩家加入服务器而改变）

原文

My GUI locks up because I need to update it through the EDT, however, I need to also pass a variable that is being updates with the GUI:

while ((message = this.in.readLine()).startsWith("NUMPLAYERS"))
{
    numOfPlayers = Integer.parseInt(message.split(":")[1]);
    numPlayers.setText("There are currently " + numOfPlayers + " players in this game");
}

This does not work. I need to set the text in the EDT but I cannot pass numOfPlayers to it without declaring it as final (which I don't want to do, because it changed as new players join the server)

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尤怨 2024-07-24 07:37:05

最简单的解决方案是使用 final 临时变量：

final int currentNumOfPlayers = numOfPlayers;
EventQueue.invokeLater(new Runnable() {
    public void run() {
       numPlayers.setText("There are currently " + 
               currentNumOfPlayers + " players in this game");
    }
});

The easiest solution would be to use a final temporary variable:

final int currentNumOfPlayers = numOfPlayers;
EventQueue.invokeLater(new Runnable() {
    public void run() {
       numPlayers.setText("There are currently " + 
               currentNumOfPlayers + " players in this game");
    }
});

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音盲 2024-07-24 07:37:05

您必须将其定为最终版本，或者让 Runnable 引用字段（类变量）。如果引用一个字段，请确保它是线程安全的（通过同步或易失性）。

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爱情眠于流年 2024-07-24 07:37:05

怎么样：

while ((message = this.in.readLine()).startsWith("NUMPLAYERS")) {
    numOfPlayers = Integer.parseInt(message.split(":")[1]);
    final newText = "There are currently " + numOfPlayers + " players in this game";
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            numPlayers.setText(newText);
        }
    });
}

注意：我认为OP有充分的理由不将numOfPlayers标记为final，也许稍后会在代码中的同一个while循环中更改它与问题无关，因此未显示。因此，numOfPlayers 是在 while 循环之前声明的。

如果没有这个假设，我就不会创建附加变量 newText。

How about this:

while ((message = this.in.readLine()).startsWith("NUMPLAYERS")) {
    numOfPlayers = Integer.parseInt(message.split(":")[1]);
    final newText = "There are currently " + numOfPlayers + " players in this game";
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            numPlayers.setText(newText);
        }
    });
}

NOTE: I assume that the OP has a good reason for not marking numOfPlayers as final, perhaps that it is changed later in the same while loop in code that's not relevant to the question, so not shown. And thus that numOfPlayers is declared before the while loop.

Without this assumption, I wouldn't make the additional variable newText.

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墨离汐 2024-07-24 07:37:05

在方法之外定义此类：（

public abstract class MyRunnable implements Runnable {
    protected int var;
    public MyRunnable (int var) {
        this.var = var;
    }
}

Now your code can look like this:
SwingUtilities.invokeAndWait(new MyRunnable(5) {
    @Override
    public void run() {
        //numPlayers.setText("There are currently " + var + " players in this game");
    }
});

出于本示例的目的，我假设有充分的理由说明为什么使用本地作用域的最终临时变量不起作用。老实说，我想不出该限制的任何原因，尽管。）

Define this class outside of your method:

public abstract class MyRunnable implements Runnable {
    protected int var;
    public MyRunnable (int var) {
        this.var = var;
    }
}

Now your code can look like this:
SwingUtilities.invokeAndWait(new MyRunnable(5) {
    @Override
    public void run() {
        //numPlayers.setText("There are currently " + var + " players in this game");
    }
});

(For the purposes of this example, I am assuming that there is a good reason why using a locally scoped final temp variable will not work. I honestly can't think of any reason for that restriction, though.)

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