sampleinheritance.as

《Flash AS3殿堂之路》光盘源码 学习ActionScript 3.0

package org.kingda.book.basicoop.inheritance
{
	import flash.display.Sprite;

	public class SampleInheritance extends Sprite
	{
		public function SampleInheritance() {
			var rmb:Money = new Money();
			var dollar:Dollar = new Dollar();
			var euro:Euro = new Euro();
			rmb.exchange(100);
			dollar.exchange(100);
			euro.exchange(100);
			usemoney(rmb);		
			usemoney(dollar);	//使用Dollar子类实例
			usemoeny(euro);		//使用Euro子类实例
		}
		
		private function usemoney(o:Money):void {}
		
	}
}
//货币
class Money {
	protected var _name:String; //币名
	protected var _rate:Number;	//汇率
	public function Money() {
		init();		
	}
	protected function init():void {
		_name = "RMB(Default)"; //默认人民币
		_rate = 1;
	}
	//汇率转换：将输入的货币数量兑换成人民币
	public function exchange(num:Number):void {
		trace ( _name + ":" + (num * _rate));
	}
}
//美元
class Dollar extends Money {
	override protected function init():void {
		_name = "USD";//美元
		_rate = 7.68;
	}
}
//欧元
class Euro extends Money {
	override protected function init():void {
		_name = "EUR";//欧元
		_rate = 10.43;
	}
}