AS3简单问题（Flex）

private var chartData1:ArrayCollection = new ArrayCollection([
  {年份:2005,收入:23.5},
  {年份:2006,收入:26.2},
  {年份:2007,收入:30.1},
  {年份:2008,收入:29.5},
  {年份:2009,收入:24.6}
  ]);
如这个ArrayCollection，怎么取出“年份”，“收入”，和这一项的个数“2”，通过chartData1这个数组名来取？

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帮助文档上有个例子:

package {
    import flash.display.Sprite;
    public class Array_filter extends Sprite {
        public function Array_filter() {
            var employees:Array = new Array();
            employees.push({name:"Employee 1", manager:false});
            employees.push({name:"Employee 2", manager:true});
            employees.push({name:"Employee 3", manager:false});
            trace("Employees:");
            employees.forEach(traceEmployee);
           
            var managers:Array = employees.filter(isManager);
            trace("Managers:");
            managers.forEach(traceEmplo