в 09:19, 26 мая 2010

2010-05-26T09:19:12Z

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2010-05-26T08:14:45Z

1 версия

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==Add new method to the children class==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var bInstance = new B( );
bInstance.m(); // Displays: Method m( ) was called
bInstance.n(); // Displays: Method n( ) was called
trace(bInstance.v); // Displays: 10

}
}
}
class A {
public var v = 10;
public function m ( ) {
trace("Method m( ) was called");
}
}
class B extends A {
public function n ( ) {
trace("Method n( ) was called");
}
}
Method m( ) was called
Method n( ) was called
10
</source>

==A Primer on Inheritance==



<source lang="java">

package{
import flash.display.Sprite;

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

var aInstance = new A( );
aInstance.m(); // Displays: Method m( ) was called
trace(aInstance.v); // Displays: 10
var bInstance:B = new B( );
bInstance.m(); // Displays: Method m( ) was called
trace(bInstance.v); // Displays: 10

}
}
}
class A {
public var v = 10;
public function m ( ) {
trace("Method m( ) was called");
}
}
class B extends A {
}
Method m( ) was called
10
Method m( ) was called
10
</source>

==Call super constructor with parameter==



<source lang="java">

package{
import flash.display.Sprite;

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

}
}
}
class Ball {
private var r;
public function Ball (radius) {
r = radius;
}
}

class ColoredBall extends Ball {
private var c;
public function ColoredBall (radius, color) {
super(radius);
c = color;
}
}
</source>

==Class Scope: Code placed at the top-level of a class body resides in that class"s scope.==



<source lang="java">

package {
public class SomeClass {
// Code here is in the someClass scope
}
}
package {
public class SomeClass extends SomeParentClass {
}
}
package {
public class SomeParentClass {
}
}
</source>

==Constructor Methods in Subclasses==



<source lang="java">

package{
import flash.display.Sprite;

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

}
}
}
class A {
public function A ( ) {
}
}
class B extends A {
public function B ( ) {
// Invoke superclass"s constructor method
super( );
}
}
</source>

==Extends the super class==



<source lang="java">

/*
class ClassName extends SuperClassName {
// Class definition goes here.
}
*/

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var rBunny:Rabbit = new Rabbit("William", "White and Brown");

trace(rBunny.name); // Displays: William
trace(rBunny.coloration); // Dislays: White and Brown
}
}
}
class Mammal {
var _sName:String;
public function get name():String {
return _sName;
}
public function set name(sName:String):void {
_sName = sName;
}
}
class Rabbit extends Mammal {
public var _sColoration:String;
public function Rabbit(sName:String, sColoration:String) {
_sName = sName;
_sColoration = sColoration;
}
public function get coloration():String {
return _sColoration;
}
}
</source>

==If a subclass does not define a constructor, ActionScript automatically creates one and adds a super call as its only statement.==



<source lang="java">

class B extends A {
public function B ( ) {
super( );
}
}
class B extends A {
}

class Rectangle {
protected var w = 0;
protected var h = 0;
public function Rectangle (width, height) {
setSize(width, height);
}
public function setSize (newW, newH) {
w = newW;
h = newH;
}
public function getArea ( ) {
return w * h;
}
}
class Square extends Rectangle {
public function Square (side) {
super(side, side);
}
override public function setSize (newW, newH) {
if (newW == newH) {
super.setSize(newW, newH);
}
}
}
</source>

==Static Methods and Static Variables Not Inherited==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var bInstance = new B( );
bInstance.s(); // Error
}
}
}
class A {
public static function s ( ) {
trace("A.s( ) was called");
}
}
class B extends A {
public function B ( ) {
}
}
</source>

==Three-level inheritance==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var cInstance = new C( );
cInstance.m(); // Displays: Method m( ) was called
cInstance.n(); // Displays: Method n( ) was called
cInstance.o(); // Displays: Method o( ) was called
trace(cInstance.v); // Displays: 10
}
}
}
class A {
public var v = 10;
public function m ( ) {
trace("Method m( ) was called");
}
}
class B extends A {
public function n ( ) {
trace("Method n( ) was called");
}
}
class C extends B {
public function o ( ) {
trace("Method o( ) was called");
}
}
</source>

==You can call the superclass implementation from the subclass implementation using the super keyword to reference the superclass:==



<source lang="java">

class Superclass {
public function Superclass( ) {}
public function toString( ):String {
return "Superclass.toString( )";
}
}
class Subclass extends Superclass {
public function Subclass( ) {}
override public function toString( ):String {
super.toString();
return "Subclass.toString( )";
}
}
</source>

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

в 09:19, 26 мая 2010

Admin: 1 версия