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As i understand you have an class named "Preprocessing". Now you should have "datatweets" as your instance variable of the class.

据我所知,你有一个名为“预处理”的类。现在你应该有“datatweets”作为类的实例变量。

Now you should create an object of Preprocessing and call the method "Process". In the method process you should fill the arraylist "datatweets". Process method should contain below code.

现在,您应该创建一个Preprocessing对象并调用方法“Process”。在方法过程中,您应该填充arraylist“datatweets”。处理方法应包含以下代码。

if(this.dataTweets == null)
 this.dataTweets = new ArrayList<>();

this.dataTweets.add(myData);

Once the datatweets is filled by calling the process method. You should have getter method in same class which should return datatweets

通过调用process方法填充datatweets之后。你应该在同一个类中有getter方法,它应返回datatweets

public List<String> getDataTweets(){
return this.dataTweets;
}

Now the main function should look like this

现在主要功能应该是这样的

public static void main(String[] args){
Preprocessing preprocessor = new Preprocessing();
preprocessor.Process();
List<String> dataTweets = preprocessor.getDataTweets();
 //Now iterate over this you will surely get data.
}

You class Preprocessor should be like this

您的类预处理器应该是这样的

public class Preprocessor{
 private List<String> dataTweets;
 public void process(){
    //processing
   this.dataTweets.add(data);
 }
 public List<String> getDataTweets(){
   return this.dataTweets;
 }
}