parsing - How to access and retrive Sets, Maps, and others variables from an FXMLController using Java 8 -

summary:  

i using javafx fxml load text file fxmlparsemecontroller.java , perform few parses , edits via class called readfile.java. so, load text file --> pass class -->for each complete line gets edited pass contructor pattern match assign found matches variables, hashmap or sets. missing link how access parsed , new assigned values fxml..controller class?

my setup: 

after controller load stage , select file, pass "filepath" readfile class. , testing, printout new modified lines after parse via console.

fxmlparsemecontroller.java

readfile file = new readfile(filepath); list<string> arylines  = file.openfile();  arylines.foreach(system.out::println); 

readfile.java

public class readfile { private string path;    readfile(string filepath) {     path = filepath; } public list<string> openfile() throws ioexception {     try (bufferedreader br = new bufferedreader(new filereader(path))) {         string line;         stringbuilder concatenatedline = new stringbuilder();         list<string> formattedstrings = new arraylist<>();         //few while loops , if statements, pass:          testscan(concatenatedline);     }  private void testscan(stringbuilder concatenatedline) {    if (..) {        string str1 = "some value";    }else if (...){        set<string> str2 = new treeset<string>();        str2.add("value");    } 

now, how can retrieve or display string str1 , set str2 fxmlparsemecontroller.java?