Apple WebObjects 3.5 Manuel d'utilisateur télécharger pdf (Page 62)

Chapter 4 Debugging a WebObjects Application

• The pageWithName method creates the page by looking up and instantiating

the component class that has the same name as the argument you provide

pageWithName. For this reason, your subclass of Component shouldn’t be

given a package name. For example, if you create a component named

MyPage.wo and place its Java ﬁle in the package myClasses.web, pageWithName won’t

ﬁnd the

MyPage.class ﬁle.

• Java is a more strictly typed language than is Objective-C or WebScript. If

you’re more familiar with Objective-C, you’ll ﬁnd that you need to cast the

return types frequently. For example, suppose you deﬁne a method named

verify in the ﬁle Session.java and you want to invoke that method from a

component’s Java ﬁle. To do so, you must cast the return type of the

component’s

session method as in the following:

// From a component’s Java file.

((Session)session()).verify();

By deﬁnition, session returns a WebSession object. Because WebSession

does not deﬁne a method named

verify, your code won’t compile unless you

cast the return value of

session to your WebSession subclass.

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 217 218

Pas de commentaire

Apple WebObjects 3.5 Manuel d'utilisateur Page 62