Javafx TableCell开始编辑时，显示旧值

import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.scene.Scene;
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.stage.Stage;

public class TableCellExample extends Application {

    public static class Person {
        private final StringProperty name;

        public Person(String name) {
            this.name = new SimpleStringProperty(name);
        }

        public StringProperty nameProperty() {
            return name;
        }
    }

    @Override
    public void start(Stage primaryStage) {
        TableView<Person> tableView = new TableView<>();
        TableColumn<Person, String> nameColumn = new TableColumn<>("Name");
        nameColumn.setCellValueFactory(cellData -> cellData.getValue().nameProperty());
        nameColumn.setCellFactory(column -> new TableCell<Person, String>() {
            private TextField textField;

            @Override
            public void startEdit() {
                super.startEdit();
                if (textField == null) {
                    createTextField();
                }
                setText(null);
                setGraphic(textField);
                textField.setText(getString());
                textField.selectAll();
            }

            @Override
            public void cancelEdit() {
                super.cancelEdit();
                setText(getString());
                setGraphic(null);
            }

            @Override
            public void updateItem(String item, boolean empty) {
                super.updateItem(item, empty);
                if (empty) {
                    setText(null);
                    setGraphic(null);
                } else {
                    if (isEditing()) {
                        if (textField != null) {
                            textField.setText(getString());
                        }
                        setText(null);
                        setGraphic(textField);
                    } else {
                        setText(getString());
                        setGraphic(null);
                    }
                }
            }

            private void createTextField() {
                textField = new TextField(getString());
                textField.setMinWidth(this.getWidth() - this.getGraphicTextGap() * 2);
                textField.setOnKeyPressed(event -> {
                    if (event.getCode().equals(KeyCode.ENTER)) {
                        commitEdit(textField.getText());
                    } else if (event.getCode().equals(KeyCode.ESCAPE)) {
                        cancelEdit();
                    }
                });
            }

            private String getString() {
                return getItem() == null ? "" : getItem();
            }
        });

        tableView.getColumns().add(nameColumn);
        tableView.getItems().add(new Person("John Doe"));

        primaryStage.setScene(new Scene(tableView));
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}