java无法将组件添加到布局中
大家好,我有个奇怪的问题,但我肯定我在做蠢事。 在maven项目中,我的UI类如下:
package my.vaadin.project.exceptionTest;
import javax.servlet.annotation.WebServlet;
import com.vaadin.annotations.Theme;
import com.vaadin.annotations.VaadinServletConfiguration;
import com.vaadin.annotations.Widgetset;
import com.vaadin.server.VaadinRequest;
import com.vaadin.server.VaadinServlet;
import com.vaadin.ui.Button;
import com.vaadin.ui.Button.ClickEvent;
import com.vaadin.ui.Label;
import com.vaadin.ui.TextField;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;
@Theme("mytheme")
@Widgetset("my.vaadin.project.exceptionTest.MyAppWidgetset")
public class MyUI extends UI {
@Override
protected void init(VaadinRequest vaadinRequest) {
final VerticalLayout layout = new VerticalLayout();
final Calculation calculation = new Calculation();
final Label title = new Label("Calculation");
layout.addComponents(title, calculation);
layout.setMargin(true);
layout.setSpacing(true);
setContent(layout);
}
@WebServlet(urlPatterns = "/*", name = "MyUIServlet", asyncSupported = true)
@VaadinServletConfiguration(ui = MyUI.class, productionMode = false)
public static class MyUIServlet extends VaadinServlet {
}
}
然后我有另一个类,它包含各种字段,然后我尝试将这些字段添加到UI中,但没有成功:
package my.vaadin.project.exceptionTest;
import java.awt.Component;
import com.vaadin.ui.Button;
import com.vaadin.ui.Button.ClickEvent;
import com.vaadin.ui.CustomComponent;
import com.vaadin.ui.TextField;
import com.vaadin.ui.VerticalLayout;
import com.vaadin.event.Action;
public class Calculation extends CustomComponent{
final VerticalLayout vl = new VerticalLayout();
final TextField divisor = new TextField();
final TextField dividend = new TextField();
Button button = new Button("Click Me");
public Calculation(){
divisor.setCaption("Enter the divisor:");
dividend.setCaption("Enter the dividend:");
button.addClickListener( new Button.ClickListener(){
@Override
public void buttonClick(ClickEvent event) {
System.out.println("this is a test");
}
});
vl.setMargin(true);
vl.setSpacing(true);
vl.addComponents(divisor, dividend, button );
}
}
所以我的问题是,当我在UI课堂上
layout.addComponents(title, calculation);
我得到了一个错误:“方法addComponents(Component…)类型AbstractComponentContainer不适用于参数(标签、计算) 我以前也做过类似的事情,比如创建一个单独类的对象,并将其添加到布局中,但它成功了,这次没有,我不确定我做错了什么。。。知道吗? 谢谢
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