Java用参数创建线程

Question

I have a program that counts several times a word in the text. I want the loop to be in a separate thread. How can I pass parameters articles and stringToSearch to the thread, or set the global parameters?

public class Main {
    public static void main(String[] args)  {
        Scanner s = new Scanner(System.in);
        int numberArticles = s.nextInt();
        ArrayList<Article> articles = new ArrayList<>(); 
        for(int i = 0; i < numberArticles; i++) {
            String articleName = s.nextLine();
            String content = ""; 
            File file = new File(articleName + ".txt"); 
              BufferedReader br;
            try {
                br = new BufferedReader(new FileReader(file));
                  String st; 
                  while ((st = br.readLine()) != null) {
                    content += st; 
                  } 
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } 
            articles.add(new Article(articleName, content));
        }
        String stringToSearch = s.nextLine();
        MyThread myThread = new MyThread();
        myThread.start();
    }
}
public class MyThread extends Thread {
    public void run(){
        for(Article article : articles) {
            int counter = 0;
            String[] words = article.getContent().split(" ");
            for (String word : words) {
                if(word.equals(stringToSearch)) {
                    counter++;
                }
            }
        }
    }
  }

Answer 1

You are extending Thread with your custom class. And you can add any number of any additional properties to that class ( MyThread ). And you can create a constructor in MyThread to pass all those parameters.

Answer 2

Here's an example showing how to pass some values into the constructor for your MyThread class. This passes two things into the constructor which then saves them to private members which can then be used within the run() method. I removed most of the other code from your question since it wasn't required for this explanation.

import java.util.ArrayList;

public class Scratch2 {
    public static void main(String[] args) {
        ArrayList<Article> articles = new ArrayList<>();
        String stringToSearch = "...";

        MyThread myThread = new MyThread(articles, stringToSearch);
        myThread.start();
    }
}

public class MyThread extends Thread {
    private final ArrayList<Article> articles;
    private final String stringToSearch;

    public MyThread(ArrayList<Article> articles, String stringToSearch) {
        this.articles = articles;
        this.stringToSearch = stringToSearch;
    }

    public void run() {
        for (Article article : articles) {
            // ... do things with "stringToSearch"
        }
    }
}

class Article {

    // more stuff here

}