代码段如下：

HashSet<String> listView = StringOperations.printListView(ReadPDFFile2.map2);

    Iterator<String> it = listView.iterator();
     while(it.hasnext()) { 
         i++;
              String word = it.next();

              Label lbl = new Label(word);
              save = new Button("Save");
              save.setId(word);
              save.setOnaction(e ->{
                    System.out.println("clicked.. to save: "+ save.getId());
                     saveWords(save.getId());
                 });

              root.getchildren().addAll(lbl,save);

      }


public void saveWords(String word) {

    if(fileType.equals("Word")) {

        String s = word + ","+ fileNameIV;
        System.out.println("saving "+s+" in PDFHashSet for now");
        savedDOCXWords.add(s);

    }
    else {
        String s = word + ","+ fileNameIV;
        System.out.println("saving "+s+" in PDFHashSet for now");
        savedPDFWords.add(s);
    }
}

UI上的输出如下：

这是正确的，但是当我单击这些按钮中的任何一个时，控制台中的输出如下：

clicked.. to save: cancelreaderthread
saving cancelreaderthread,in PDFHashSet for now

clicked.. to save: cancelreaderthread
saving cancelreaderthread,in PDFHashSet for now

这意味着，它仅记住最后创建的按钮。我们如何使它分别记住所有按钮？