Generic Methods of Vector in Java

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Generic Methods of Vector
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Vector methods correspond almost exactly to Array methods, substituting the type parameter (T) wherever elements are concerned where Array would use *. This makes it easy to switch over code that uses Arrays. Without covering every method, let s look at those that are a bit tricky.
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9: Vectors
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concat(... args):Vector.<T> push(... args):uint
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Because these methods can take a list of elements to add to the Vector all at once, they use a variable argument list instead of type T. As you saw earlier, this means that the arguments are not type-checked at compile time. They are still checked against the type parameter T at runtime.
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every(callback:Function, thisObject:Object = null):Boolean some(callback:Function, thisObject:Object = null):Boolean filter(callback:Function, thisObject:Object = null):Vector.<T>
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All these methods act the same as their Array counterparts, except that now you can expect to iterate over objects of type T, so the signature of the callback function must be:
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function callback(item:T, index:int, vector:Vector.<T>):Boolean forEach(callback:Function, thisObject:Object = null):void
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This method, too, can expect to iterate over objects of type T, and the callback takes the form:
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function callback(item:T, index:int, vector:Vector.<T>):void map(callback:Function, thisObject:Object = null):Vector.<T>
The map() method is identical in that the callback signature must be modi ed to take a T and return a T:
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function callback(item:T, index:int, vector:Vector.<T>):T
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Oddly, this prevents map() from being very useful, as the idea of map() is to process one type of information into another. If you are limited to converting type T to type T, you can no longer do very interesting mappings.
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First, Vector has no sortOn() method. Second, this sort function, too, can operate on type T:
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function compareFunction(x:T, y:T):Number
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Finally, every method that nondestructively modi es a Vector by returning a new one returns a non- xed-size Vector, even if the input Vector was xed-size. As you have seen in the examples, fast iteration and for loops works for Vectors just like it works for Arrays. Example 9-3 uses fast iteration and several of the methods of Vector to create a menu. EXAMPLE 9-3
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Vector Methods and Fast Iteration
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package { import flash.display.Sprite; import; import flash.text.TextField;
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Part II: Core ActionScript 3.0 Data Types
import flash.text.TextFieldAutoSize; import flash.text.TextFormat; public class ch9ex3 extends Sprite { protected var labels:Vector.<TextField>; protected const DEFAULT_FORMAT:TextFormat = new TextFormat("_sans", 12, 0x000000, true); protected const SELECTED_FORMAT:TextFormat = new TextFormat("_sans", 12, 0x00ffff, true); protected const MARGIN:Number = 20; public function ch9ex3() { labels = new Vector.<TextField>; makeMenuItem("home"); makeMenuItem("about"); makeMenuItem("blog"); makeMenuItem("contact"); } protected function makeMenuItem(label:String):void { var tf:TextField = new TextField(); tf.selectable = false; tf.defaultTextFormat = DEFAULT_FORMAT; tf.text = label; tf.width = tf.height = 0; tf.autoSize = TextFieldAutoSize.LEFT; if (labels.length > 0) { var lastTF:TextField = labels[labels.length-1]; tf.x = lastTF.x + lastTF.textWidth + MARGIN; } addChild(tf); labels.push(tf); tf.addEventListener(MouseEvent.CLICK, onItemClick); } protected function onItemClick(event:MouseEvent):void { for each (var tf:TextField in labels) { tf.setTextFormat((tf == SELECTED_FORMAT:DEFAULT_FORMAT); } } } }
Creating and Converting Vectors
To create a Vector, just use the Vector() constructor. The constructor takes two parameters: an initial length (which defaults to 0) and a determination of whether the Vector should be xed-size (which defaults to false). Its signature is:
Vector(length:uint = 0, fixed:Boolean = false)
9: Vectors
Vector literals
You can type Vector literals into your code just like Array literals. Simply use the Vector literal syntax:
var v:Vector.<int> = new <int>[1, 2, 3, 4, 5];
The literal syntax ends in the same way you d write an Array directly into code, but it begins with the new keyword and the actual type used in the Vector instance. If this results in a compiler error, you may need to use a more recent compiler. Using push() with as many elements as you would like accomplishes the same thing with only a little more code, so you use push() to instantiate Vectors in the examples in this chapter for the sake of compatibility.