JavaFX:我可以访问它包含的节点吗？

Question

所以我有一个 BorderPane ，它有一个设置在中心的 TextArea 。它显示有关当年销售额的信息:

public static BorderPane addTransactionPanel() {

    BorderPane pane = new BorderPane();
    pane.setPrefSize(500, 320);
    final String[] monthName = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};

    final TextArea middle = new TextArea();
    middle.setPrefRowCount(1000);
    middle.setEditable(false);

    pane.setBottom(addBox);
    pane.setCenter(middle);

    for (int i = 2; i < li.get(index).getIncomeBook().getExpense().size(); i++) {
        if (li.get(index).getIncomeBook().getExpense().get(i).getDate().getYear() == year) {
                middle.appendText("New expense of: $" + moneyDisplay(li.get(index).getIncomeBook().getExpense().get(i).getValue()) + " on " + monthName[li.get(index).getIncomeBook().getExpense().get(i).getDate().getMonth() - 1] + "\n");
        }
    }

    return pane;
 }

这会比较 IncomeBook 支出的内容(及其花费的年份)，如果与当前年份匹配，则会将文本附加到 TextArea 上。但现在，当我更改年份(这是一个公共(public)变量)时，我希望它更新。我正在尝试创建另一种方法:

public void updateTransactionPanel(BorderPane transactionPanel){
    // I want to clear transactionPanel.middle and write in it again.
    // Can I access the "middle" Node from another method?
}

Answer 1

从另一个方法访问transactionPanel的“中间”节点，清除它并重新写入。

public void updateTransactionPanel(BorderPane transactionPanel){
    TextArea middle = (TextArea) transactionPanel.getCenter();
    middle.setText("Updated transaction panel text");
}