.NET/Java PDF, Tiff, Barcode SDK Library

<form:form> <form:errors cssClass="errors" path="username"/> <label>Username: ${command.username}</label> <form:hidden path="username"/> <input type="submit" name="_eventId_edit" value="Cancel"/> <input type="submit" name="_eventId_save" value="Save User"/> </form:form> The custom tags used to render parts of these forms are discussed in more detail in the Tag Libraries section later in this chapter.

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Y) velocity = new Vector2(velocityX, -velocityY); // Checking left boundary if (positionX + velocityX < 0) velocity = new Vector2(-velocityX, velocityY); // Checking upper boundary if (positionY + velocityY < 0) velocity = new Vector2(velocityX, -velocityY); // Since we adjusted the velocity, just add it to the current position position += velocity; } Because Vector2 classes represent both the sprite position and velocity, you could simply add the vectors to change the sprite position However, because you don t want to add the velocity if it will take the sprite off the screen, you include code to invert the velocity in this situation Checking for left and top screen boundaries is a direct test, because the sprite position is given by its upper-left corner.

In Spring MVC and Spring Web Flow, forms are handled by converting their string representations to and from the properties of a POJO. This POJO is referred to as the command object. The fields of the command object are populated by the controller when a form is submitted. When the form is initially rendered, a command object may be populated by the controller from the incoming request parameters and supplied to the page; this is the behavior when you set the bindOnNewForm attribute in AbstractFormController and its derived classes. The same form bean may be used by multiple controllers, or by multiple steps in a single controller as, for example, with classes derived from AbstractWizardFormController. If the controller is permitted to use the HttpSession object, maintaining the content of the command object between actions is relatively simple. However, session objects come with their own problems. If you intend to operate without the session, you must ensure that any fields of the command object that are not currently editable or visible in the forms are rendered as hidden HTML form fields so that they are available to reconstruct the command object upon form submission. In addition to the problem of maintaining the content of a command object for controllers spanning multiple form submissions, there is the problem of managing collections of objects. The collection classes are not well suited to the representation of fields in the command object because they have no associated type information at runtime. Even if using Java generics, a List<String> will be converted to a plain List at runtime by a process known

However, when checking if the sprite will leave the screen on the right, you must add the sprite width to the sprite s X position to make the sprite bounce with its right corner, or it would leave the screen before bouncing back Similarly, when checking if the sprite is leaving through the bottom of the screen, you must add the sprite height to its Y position so the sprite will bounce with its bottom As a final step, include the call to the sprite s Move method in the Update method of the Game1cs class: mySprite1Move(); Read the code carefully to be sure you understand the tests, and then run the code The sprite will move across the screen and bounce against the window borders!.

as erasure. This means that there is no information available to Spring s PropertyEditors to determine the type that associated form fields should be converted to. Your alternatives are to add additional manual binding of these properties upon form submission, or to use Java array types where a collection class might otherwise have been more suitable.