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Programmers then manually cast and unbox the objects as needed In typed AOP, the program can pass an int parameter to an advice code, whereas in the generic case, the same parameter will be an Object to be cast into an Integer instance Both techniques have their advantages and drawbacks Typed AOP permits a certain degree of program validation during the compilation and weaving phases As a consequence, the IDE can potentially offer better support in terms of code completion, contextual help, and browsing On the other hand, typed AOP is less flexible and makes it more difficult to write reusable advice code, as previously shown in the retry aspect Typed AOP implies a strong dependency between the base program and the aspects.

2. Switch to the Selection tool, as shown in Figure 2-3, by either clicking it or pressing the V key.

When you roll the tool over the square, a cross with arrows appears under the mouse pointer. This means you are hovering over an object that can be moved by clicking and dragging.

All tools can be selected using the keyboard. If you roll the mouse pointer over a tool, a tooltip, as shown in Figure 2-3, will appear, and the letter between the brackets is the key that can be pressed to select the tool. If you find tooltips annoying, open Preferences General and deselect Show tooltips in the Selection section of the Preferences dialog box.

If the base program interface changes, it is likely to have an impact on the aspect s implementation, including the advice code, which can prevent reusability and evolution This is the separation of concerns paradox: the better the concerns are separated, the less likely they are to evolve separately Conversely, generic AOP allows the creation of generic and reusable aspects However, it almost completely disables the compile- and weaving-time tests Consequently, programmers should be more careful when programming with generic AOP With regard to performance, typed AOP has a great advantage over generic AOP, especially when advice code uses the advised method parameters Indeed, the reflexive access to the arguments implies the creation of an array of objects, which is the primary reason for performance loss in generic AOP and, more generally, in reflective programming (see the javalangreflect API).

possible to the poorly written HTML page. Most browsers work by having two rendering modes, based on the doctype of the HTML page (if it s available): strict and quirks. Web browsers use a strict mode when the doctype indicates that a Web page is written to follow a certain W3C recommendation, such as HTML 4.1 or XHTML 1.0. Web browsers use a quirks mode when a doctype is not available or when the page has a number of conflicts with the specified doctype. As a developer, you should strive to create pages that adhere to a certain W3C standard. Doing so not only makes your Web pages accessible to all modern Web browsers but also makes your own life easier by ensuring that the browser can create an accurate representation of the DOM from the HTML code. The browser may not be able to create an accurate representation of the DOM if the page is poorly written, forcing the browser into rendering the page using a quirks mode. An incorrect representation of the DOM may make it difficult to access and modify the DOM via JavaScript, especially in a cross-browser way. Since HTML does not have a strict compiler, how can you ensure that the HTML code you write adheres to W3C standards Fortunately, a couple of extensions are available for the Firefox Web browser that make it easy to validate your Web pages.

3. Click the square, and drag to the right. Holy smokes, you just pulled the fill out of the square (see

Figure 2-4. Selections in Flash aren t always what they seem. You have just discovered that Flash regards all objects you draw as being composed of two things: a stroke and a fill. If you are an Illustrator, Photoshop, or Fireworks user, this may strike you as being a bit odd because in a vector universe separating the stroke from its fill is not a common behavior. Give us a minute, and we ll ease you back into more familiar territory. We have a square to move.

second is to marquee the stroke and the fill by drawing a selection box around the object. To draw your selection box, click outside the rectangle near one of its corners, and then drag toward the opposite corner. Go ahead try both methods of selection, and drag the square. You ll see the whole square move this time.

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