java - 在 HashSet 迭代上动态创建 javafx 按钮。如何为每个按钮创建单独的actionEvent？

Question

代码片段如下:

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

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

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

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

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

这意味着，它只记住最后创建的按钮。我们怎样才能让它单独记住所有按钮呢？

Answer 1

这是因为您正在覆盖对您的作用域的全局对象的相同引用。

save = new Button("Save");

将其更改为作用域中自己的引用，并删除此代码其余部分上方的该变量。

Button save = new Button("Save");