Java (Android) 线程，访问同一列表

发布于 2024-11-07 00:09:30 字数 1162 浏览 3 评论 0原文

我是 Java 和 Android 新手，请耐心等待。

我有一个要在主 UI 上填充的字符串数组列表。

我有另一个线程通过套接字逐一发送 arrayList 的字符串，并在发送每个字符串后将其从列表中删除。

所以基本上它是一个 FIFO ，有两个不同的线程访问同一个 arrayList。

我怎样才能使这个阅读和写作在同一个列表上，线程安全？因为我读到我必须这样做，从而防止将来出现错误。

我的第一个想法是创建一个同步方法来访问 arrayList。

这是我创建的用于通过两个线程访问 ArrayList 的方法。

public synchronized String accessArrayList(boolean add, boolean get, String utt)
{
    if(add){            
        mStrings.add(utt);
        return null;
    }
    else if(get){
        return mStrings.get(0);

    }
    else{
        mStringsUttComm.remove(0);
        return null;
    }


}

主线程只是将字符串添加到这个列表中。

第二个线程执行此操作：

Runnable runner = new Runnable() {
      public void run() {
          while(!mString.isEmpty()){
                              //socket sends string               
              sc.actionPerformed(accessArrayList(false, true, null));
                              //erase from list
              accessArrayList(false, false, null);
          }

      }
};

这是正确的吗？因为我是 eclipse 新手，我找不到一种方法来确认一个线程在另一个线程正在使用 accessArrayList 时不会调用它。

感谢您抽出时间。

原文

I'm new to Java and Android so bear with me.

I have one arrayList of strings that i am filling on the main UI.

I have another thread that is sending one by one the strings of the arrayList through a socket, and after sending each one it erases it from the list.

So basically it's a FIFO , with two different threads accessing the same arrayList.

How can I make this reading and writing on the same list, thread safe? Because I read that I have to, thus preventing future errors.

My first thought was creating a synchronized method to access the arrayList.

This is the method I created to access the ArrayList by both threads.

public synchronized String accessArrayList(boolean add, boolean get, String utt)
{
    if(add){            
        mStrings.add(utt);
        return null;
    }
    else if(get){
        return mStrings.get(0);

    }
    else{
        mStringsUttComm.remove(0);
        return null;
    }


}

The main thread just add's strings to this list.

The second thread does this :

Runnable runner = new Runnable() {
      public void run() {
          while(!mString.isEmpty()){
                              //socket sends string               
              sc.actionPerformed(accessArrayList(false, true, null));
                              //erase from list
              accessArrayList(false, false, null);
          }

      }
};

Is this correct? Because I am new to eclipse and I can't find a way to confirm that one thread doesn't call accessArrayList if the other one is using it.

Thank you for your time.

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