方法无法解决

Question

我想在我的界面中添加一个计时器栏，但是当我尝试在进度栏中设置setValue时，无法解析setValue方法。我在这里做错了什么，谁能告诉我如何解决这个问题。谢谢你的时间。

package com.leopard.spring;

import com.vaadin.flow.component.button.Button;
import com.vaadin.flow.component.dependency.StyleSheet;
import com.vaadin.flow.component.html.H1;
import com.vaadin.flow.component.html.Label;
import com.vaadin.flow.component.orderedlayout.HorizontalLayout;
import com.vaadin.flow.component.orderedlayout.VerticalLayout;
import com.vaadin.flow.router.Route;
import javafx.scene.control.ProgressBar;
import com.vaadin.flow.component.textfield.TextField;

//import com.vaadin.flow.component.table.Table;
//import com.vaadin.ui.Table;


@Route("Playboard")
@StyleSheet("frontend://styles/style.css")
public class Playboard extends VerticalLayout {
    // private Grid<Person> grid = new Grid<>(Person.class);

    //    /
    public Playboard() {
        setLayout();
        addClassName("play-board");
        setSizeFull();

    }

HorizontalLayout timer = new HorizontalLayout();
        ProgressBar progressBar = new ProgressBar();
        progressBar.setValue(0.600);
        add(timer);}}