в 09:19, 26 мая 2010

2010-05-26T09:19:12Z

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2010-05-26T08:14:45Z

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==Invoking an Overridden Instance Method: super.methodName(arg1, arg2, ...argn);==



<source lang="java">

class Rectangle {
protected var w = 0;
protected var h = 0;
public function setSize (newW, newH) {
w = newW;
h = newH;
}
public function getArea ( ) {
return w * h;
}
}
class ScreenRectangle extends Rectangle {
override public function setSize (newW, newH) {
super.setSize(newW, newH);
draw( );
}
public function draw ( ) {
}
}
class ReadOnlyRectangle extends Rectangle {
override public function setSize (newW, newH) {
}
}
</source>

==override method from parent class==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){

var c:Cat = new Cat();
c.speak("Miao");
}
}
}
class Animal {
public function Animal() {
}
public function speak(sound:String):void {
trace(sound);
}
}
class Cat extends Animal {
public function Cat() {
}
public override function speak(sound:String):void {
for (var i:uint=0; i < 100; i++) {
super.speak("Meow! Meow! Meow!");
}
}
}
</source>

==Overriding Behavior==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var normalGull:Seagull = new Seagull();
var quietGull:Seagull = new QuietSeagull();
normalGull.squawk(); //The seagull says â��SQUAAA!"
quietGull.squawk(); //...

var politeGull:Seagull = new PoliteSeagull(); //A new seagull appears
politeGull.eat();
}
}
}
class Seagull
{
public function get weight():Number
{
return 2;
}
public function squawk():void
{
trace("The seagull says "SQUAAA!"");
}
public function fly():void{

}
public function eat():void{}
}
class QuietSeagull extends Seagull
{
override public function squawk():void
{
trace("...");
}
}
class HungrySeagull extends Seagull
{
override public function get weight():Number
{
return 1.5;
}
}
class PoliteSeagull extends Seagull
{
override public function squawk():void
{
super.squawk();
trace("The shy gull covers his mouth in shame.");
}
override public function fly():void
{
super.fly();
trace("The gull lands and apologizes for blocking out the sun.");
}
override public function eat():void
{
trace("The gull apologizes to the animal it"s about to eat.");
super.eat();
}
}

</source>

==Overriding Instance Methods==



<source lang="java">

ActionScript 3.0 allows instance methods to be redefined but not instance variables, static variables, or static methods.

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var aInstance = new A( );
aInstance.m(); // Displays: A"s m( ) was called

var bInstance = new B( );
bInstance.m(); // Displays: B"s m( ) was called
}
}
}
class A {
public function m ( ) {
trace("A"s m( ) was called");
}
}
class B extends A {
// Override the superclass"s method m( )
override public function m ( ) {
trace("B"s m( ) was called");
}
}
</source>

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Flash / Flex / ActionScript/Class/Override - История изменений

в 09:19, 26 мая 2010

Admin: 1 версия