MACROMEDIA FLEX 2-MIGRATING APPLICATIONS TO FLEX 2 Manual do Utilizador descarregar pdf (Página 15)

Step 3: Add types 15

The default access modifier for methods, variables, and classes is internal. This means that

all classes in the same package can access them, but classes outside of the package cannot.

However, the Flex compiler issues a warning if you do not specify any access modifier.

For more information about access modifiers, see “Access modifiers” on page 27. For

information about disabling warnings, see Chapter 9, “Using the Flex Compilers,” in Building

and Deploying Flex 2 Applications.

Step 3: Add types

All variables, properties, method arguments, and method return types should now be typed.

To find variables and properties, search for the keyword “var” to locate places where you

should type variables and properties.

The following table shows common variable typing tasks:

To find methods and method arguments, search for the keyword

function and add a return

type if that method returns a value and type each method argument; for example:

Flex 1.x:

function getAnswer(myString) {

...

return myString;

}

Flex 2:

public function getAnswer(myString:String):String {

...

return myString;

}

For more information, see “Explicit typing” on page 32.

Flex 1.x Flex 2

var s = "Title Page"; public var s:String = "Title Page";

var myType = event.type; public var myType:String =

String(event.type);

item = event.target.selectedItem; item =

ThumbnailView(event.target.selectedItem);

public function

myHandler(event):void

public function myHandler(event:Event):void

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