Question

我在Eclipse中有这个代码，我想设置每天显示的第一个和最后一个小时。但是，当我输入所谓的代码时，Eclipse会向我显示一个邪恶的小感叹号（在“Calendar cal = ...”下面的out-comment行中）并且不会编译（它说明了关于令牌的语法错误）。我看不出错误......我做错了什么，我该如何解决？

亲切的问候，卢卡斯

package com.example.evil_wochenplaner_of_death;

import javax.servlet.annotation.WebServlet;

import com.vaadin.annotations.Theme;
import com.vaadin.annotations.VaadinServletConfiguration;
import com.vaadin.server.VaadinRequest;
import com.vaadin.server.VaadinServlet;
import com.vaadin.ui.Button.ClickEvent;
import com.vaadin.ui.*;

@SuppressWarnings("serial")
@Theme("evil_wochenplaner_of_death")
public class EwodUI extends UI {

    @WebServlet(value = "/*", asyncSupported = true)
    @VaadinServletConfiguration(productionMode = false, ui = EwodUI.class)
    public static class Servlet extends VaadinServlet {
    }

    Calendar cal = new Calendar ();
    //cal.setFirstVisibleHourOfDay (7);

    @Override
    protected void init(VaadinRequest request) {
        HorizontalSplitPanel hspanel = new HorizontalSplitPanel ();

        setContent (hspanel);
        hspanel.addComponent (cal);
    }

}

Answer 1

您不能在课堂上直接使用cal.setFirstVisibleHourOfDay (7);这样的语句。

您可以将它移动到init方法，如下所示。

package com.example.evil_wochenplaner_of_death;

import javax.servlet.annotation.WebServlet;

import com.vaadin.annotations.Theme;
import com.vaadin.annotations.VaadinServletConfiguration;
import com.vaadin.server.VaadinRequest;
import com.vaadin.server.VaadinServlet;
import com.vaadin.ui.Button.ClickEvent;
import com.vaadin.ui.*;

@SuppressWarnings("serial")
@Theme("evil_wochenplaner_of_death")
public class EwodUI extends UI {

    @WebServlet(value = "/*", asyncSupported = true)
    @VaadinServletConfiguration(productionMode = false, ui = EwodUI.class)
    public static class Servlet extends VaadinServlet {
    }

    Calendar cal = new Calendar ();
    //cal.setFirstVisibleHourOfDay (7);

    @Override
    protected void init(VaadinRequest request) {
        HorizontalSplitPanel hspanel = new HorizontalSplitPanel ();

        setContent (hspanel);
        cal.setFirstVisibleHourOfDay(7);
        cal.setLastVisibleHourOfDay (18);
        hspanel.addComponent (cal);
    }

}

Vaadin的日历方法“setFirstVisibleHourOfDay”

1 个答案: