Java返回组件
我的程序有问题。 我正在处理 gui，我无法让它用 MenuController 类中的这一行来更改视图：
currentComponent = timeRegController.getView().userRegisterTime(user);
但我有类似的行，效果很好。 currentComponent 一个组件，它是程序正在显示的当前视图。
timeRegController.getView() 返回一个名为 view 的 TimeRegistrationPanel。
在 TimeRegistrationPanel 类中，我有以下方法：
public Component userRegisterTime(User user) {
JPanel window = new JPanel(new BorderLayout());
return window;
}
我的程序说问题出在这一行：
currentComponent = timeRegController.getView().userRegisterTime(user);
因为 userRegisterTime() 对于 Component 类型未定义。
I have a problem with my program.
I'm working on the gui, and I can't get it to change the view with this line in the class MenuController:
currentComponent = timeRegController.getView().userRegisterTime(user);
But I have similar lines, that works just fine. currentComponent an Component that is the current view that the program is showing.
timeRegController.getView() returns a TimeRegistrationPanel called view.
In the class TimeRegistrationPanel I have the following method:
public Component userRegisterTime(User user) {
JPanel window = new JPanel(new BorderLayout());
return window;
}
My program says that the problem lies in the line:
currentComponent = timeRegController.getView().userRegisterTime(user);
because userRegisterTime() is undefined for the type Component.
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评论（2）
您需要将返回值转换为
TimeRegistrationPanel类。You need to cast the return value to your
TimeRegistrationPanelclass.确保 getView() 返回 TimeRegistrationPanel。
Make sure getView() returns TimeRegistrationPanel.