Java多线程 - 将数据结构传递给线程 [英] Java multi threading - Passing a data-structure to the thread

问题描述

我正在编写的应用程序在某个阶段生成一个CharacterList of Characters。在这个阶段，我正在尝试创建一个线程来处理这个ArrayList。问题是如何将此ArrayList传递给线程

The application, I am writing, generates an ArrayList of Characters at certain stage. At this stage, I am trying create a thread to process this ArrayList. The problem is how do I pass this ArrayList to the thread

描述性代码：

class thisApp {
    /* Some initial processing creates an ArrayList - aList */

    Runnable proExec = new ProcessList (); //ProcessList implements Runnable
    Thread th = new Thread(proExec);
}

ProcessList的描述性代码：

Descriptive Code For ProcessList:

public class ProcessList implements Runnable {
    public void run() {
      /* Access the ArrayList - aList - and do something upon */
    }
}

我的问题是：如何在运行中传递和访问aList（ ）？

My problem is: How do I pass and access aList in run()?

推荐答案

您只需将 aList 传递给 ProcessList 的构造函数，可以在需要之前保留引用：

You can simply pass aList to the ProcessList's constructor, which can retain the reference until it's needed:

class thisApp {
    /* Some initial processing creates an ArrayList - aList */

    Runnable proExec = new ProcessList (aList);
    Thread th = new Thread(proExec);
}

public class ProcessList implements Runnable {
    private final ArrayList<Character> aList;
    public ProcessList(ArrayList<Character> aList) {
      this.aList = aList;
    }
    public void run() {
      /* use this.aList */
    }
}

NB 如果 aList 将由多个线程同时访问，其中一个或多个修改它的更多线程，所有相关代码都需要 synchronized 。

N.B. If aList will be accessed concurrently by multiple threads, with one or more threads modifying it, all relevant code will need to be synchronized.

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