在child class的constructor中,一定要用super呼叫parent的constructor,否則會跑出"1203: 基底類別 Parent 中找不到預設的建構函式。"這樣的錯誤訊息。
另外,在child class中,就算用的是super,也只能呼叫parent class中設為protected 和 private 的 functions 和 variables。
Parent.as
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package{ public class Parent{ private var private_var:String; protected var protected_var:String; public var public_var:String; function Parent(a:String, b:String, c:String){ private_var = a; protected_var = b; public_var = c; trace("call Parent's constructor"); } private function private_func(){ trace("call private_func"); } protected function protected_func(){ trace("call protected_func"); } public function public_func(){ trace("call public_func"); } } }
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Child.as
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package{ public class Child extends Parent{ function Child(){ super("A","B","C"); trace("call Child's constructor"); //trace(super.private_var); trace(super.protected_var); trace(super.public_var); //super.private_func(); super.protected_func(); super.public_func(); } } }
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