happysale.java

这是个简单的Java程序

interface ComputeTotalSales
{
	public abstract double totalSalesByYear();
}
class Television implements ComputeTotalSales
{
	public double totalSalesByYear()
	{
		double sales = 23010;
		return sales;
	}
}
class Computer implements  ComputeTotalSales
{
	public double totalSalesByYear()
	{
		double sales = 13050;
		return sales;
	}
}
class Mobile implements  ComputeTotalSales
{
	public double totalSalesByYear()
	{
		double sales = 36200;
		return sales;
	}
}
class Shop
{
   ComputeTotalSales[] goods;
   double totalSales=0;
   Shop(ComputeTotalSales[] goods)
   {
      this.goods=goods;
   }
   public double giveTotalSales( )
   {
      totalSales=0;
      for(int i = 0;i < goods.length; i ++ )
    	  totalSales+=goods[i].totalSalesByYear();
      return totalSales;
   }
}
public class HappySale
{
   public static void main(String args[ ])
   {
      ComputeTotalSales[ ] goods=new ComputeTotalSales[50];
      for(int i=0;i<goods.length;i++)
       {
           if(i%3==0)
             goods[i]=new Television( );
           else if(i%3==1)
             goods[i]=new Computer( );
           else if(i%3==2)
             goods[i]=new Mobile( );
       } 
     Shop  shop=new Shop(goods);
     System.out.println("商店年销售额:"+shop.giveTotalSales( ) );
    System.out.println("吕素涵 电子04-1 040214132");

   }
}