// trace(helper.protNum); // Error - 错误，不能访问protected成员
// trace(helper.privNum); // Error - 错误，不能访问private成员
trace(helper.interNum); // OK
}
}
}
// 辅助类默认是internal
class Helper {
// public声明允许在任何地方被访问
// 变量通常被设置为private的，然后通过声明public的get set方法来访问
public var pubNum:Number = 1;
// protected声明只允许在子类中被访问
protected var protNum:Number = 2;
// private声明只能在类内部被访问
private var privNum:Number = 3;
// internal声明只允许在同一个包中被访问
// 但是对于辅助类来说，只能在同一个文件类被访问
internal var interNum:Number = 4;
// 构造器永远都是public的
function Helper() {
}
}
// 子辅助类默认是internal的
// 可以继承其他辅助类
class SubHelper extends Helper {
// 构造器，public
function SubHelper() {
trace(pubNum); // OK
trace(protNum); // OK - 继承得到的
// trace(privNum); // Error - 不能访问private
trace(interNum); // OK
}
}
另外一个例子：
package {
import flash.display.Sprite;
import containers.*;
// Application class needs to be public (internal by default)
public class AccessControl extends Sprite {
// constructors are always public
function AccessControl() {
// can access classes in other packages
// only if public
var bowl:Bowl = new Bowl(); // OK
// var basket:Basket = new Basket(); // Error - cannot access internal
trace(bowl.pubNum); // OK
// trace(bowl.protNum); // Error - cannot access protected
// trace(bowl.privNum); // Error - cannot access private
// trace(bowl.interNum); // Error - cannot access internal
}
}
}
ActionScript Code:
package containers {
// public class accessible anywhere
public class Bowl {
// public access granted anywhere
public var pubNum:Number = 1;
// protected access granted only for
// subclasses in that class
protected var protNum:Number = 2;
// private access granted only in this class
private var privNum:Number = 3;
// internal access granted only in the same package
internal var interNum:Number = 4;
// constructors are always public
function Bowl() {
// can access inteneral classes if in same package
var basket:Basket = new Basket();
trace(basket.pubNum); // OK
// trace(basket.protNum); // Error - cannot access protected
// trace(basket.privNum); // Error - cannot access private
trace(basket.interNum); // OK - same package
// clone using public method
var basketCopy:Basket = basket.clone();
