Flash / Flex / ActionScript/Class/Constructor
Содержание
A class named Product with a constructor and a method
<source lang="java">
public class Product {
var price:Number;
public function Product ( ) {
}
public function doSomething ( ):void {
}
}
</source>
Add assignment code to class constructor
<source lang="java">
package com.wbex {
internal class MyClass {
internal var varName = "Unnamed";
public function MyClass (name) {
this.varName = name;
}
}
}
</source>
Add public attribute to contrustor.
<source lang="java">
class SomeClass {
public function SomeClass ( ) {
}
} The following code adds a constructor method to MyClass. package com.wbex {
public class MyClass {
public function MyClass ( ) {
}
}
}
</source>
Constructor with parameter
<source lang="java">
package{
import flash.display.Sprite;
public class Main extends Sprite{
public function Main(){
var m:MultiplyNumbers = new MultiplyNumbers(2,3);
}
}
}
class MultiplyNumbers {
public function MultiplyNumbers(num1:Number,num2:Number):void {
trace(num1*num2);
}
}
</source>
Creating a Constructor
<source lang="java">
/* function ClassName([parameterList]) {
// Constructor code goes here.
}
- /
class Car {
private var _sMake:String = null;
private var _sModel:String = null;
private var _sExteriorColor:String = null;
public function Car() {
switch(arguments.length) {
case 3:
_sExteriorColor = arguments[2];
case 2:
_sModel = arguments[1];
case 1:
_sMake = arguments[0];
}
}
}
</source>
Declare a constructor method for the Example class
<source lang="java">
package{
import flash.display.Sprite;
public class Main extends Sprite{
public function Main(){
var example:Example = new Example( );
trace(example.getId( )); // Displays: Example Class
}
}
} class Example {
private var _id:String;
public function Example( ) {
_id = "Example Class";
}
public function getId( ):String {
return _id;
}
}
</source>
Set the memeber variable in constructor
<source lang="java">
package{
import flash.display.Sprite;
public class Main extends Sprite{
public function Main(){
var crTest:Car = new Car("A", "B", "C");
} }
}
class Car {
private var _sMake:String = null;
private var _sModel:String = null;
private var _sExteriorColor:String = null;
private var _nMileage:Number;
public function Car(sMake:String,
sModel:String,
sExteriorColor:String)
{
_sMake = sMake;
_sModel = sModel;
_sExteriorColor = sExteriorColor;
_nMileage = 0;
}
}
</source>
