Java多线程 - 将数据结构传递给线程

Question

我正在编写的应用程序在某个阶段生成一个CharacterList字符.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

描述代码:

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:

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

我的问题是:如何在run()中传递和访问aList？

Answer 1

你可以简单地传递aList给ProcessList构造函数,它可以保留引用直到它需要:

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多个线程同时访问,一个或多个线程修改它,则需要所有相关代码synchronized.