用Flex写的一个入门程序

源代码如下：

 

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" 
	layout="absolute" backgroundGradientColors="[#ffffff, #ffffff]" width="225" height="379">
 <mx:Script>
  <![CDATA[
    import mx.collections.ArrayCollection;
    public function addToLesson():void
    {
                     if(lesson.dataProvider == null) 
                     {
                      lesson.dataProvider = new ArrayCollection();
                     }
     lesson.dataProvider.addItem(lessoncomb.selectedItem.label+":  " 
                               + lessoncomb.selectedItem.data);
    }
    public function reSet():void
    {
     lesson.dataProvider = null;
    }
  ]]>
 </mx:Script>
 <mx:Array id="lessonArray">
         <mx:Object label="电子商务案例分析" data="甲教授"/>
         <mx:Object label="企业业务流程管理" data="乙教授"/>
         <mx:Object label="企业资源计划（ERP）" data="丙教授"/>      
 </mx:Array>
 <mx:Panel title="选课程序" width="213" height="350" x="6" y="10">    
  <mx:Label text="课程列表"/>
  <mx:ComboBox id="lessoncomb" dataProvider="{lessonArray}"/>   
  <mx:Text id="lessontex" text="{lessoncomb.selectedItem.data}"/>  
  <mx:Button label="选择" click="addToLesson()"/>
  <mx:Button label="重置" click="reSet()"/>
  <mx:List id="lesson"/>

 </mx:Panel>
</mx:Application>