flex按值引用还是按对象引用

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<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
               xmlns:s="library://ns.adobe.com/flex/spark"
               xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" creationComplete="application1_creationCompleteHandler(event)">
    <s:layout>
        <s:BasicLayout/>
    </s:layout>
    <fx:Script>
        <!--[CDATA[
            import com.firemax.controls.FireMaxAlert;

            import mx.collections.ArrayCollection;
            import mx.events.FlexEvent;

            [Bindable]
            public var listDemo:ArrayCollection;

            var stringName:String = new String("李四");

            protected function application1_creationCompleteHandler(event:FlexEvent):void
            {
                // TODO Auto-generated method stub
                listDemo=new ArrayCollection();

                listDemo.addItem(new String("张三"));
                listDemo.addItem(stringName);
                listDemo.addItem(new String("王五"));


            }

            protected function button1_clickHandler(event:MouseEvent):void
            {
                // TODO Auto-generated method stub
                stringName="麻子";
                FireMaxAlert.show(listDemo.getItemAt(1).toString());
                //FireMaxAlert.show(stringName);
            }
        ]]-->
    </fx:Script>
    <fx:Declarations>
        <!-- 将非可视元素（例如服务、值对象）放在此处 -->
    </fx:Declarations>
    <mx:DataGrid x="46" y="33" width="403" height="212" dataProvider="{listDemo}">
        <mx:columns>
            <mx:DataGridColumn headerText="列 1" dataField="col1"/>
        </mx:columns>
    </mx:DataGrid>
    <s:Button x="46" y="275" label="按钮" click="button1_clickHandler(event)"/>
</s:Application>