computetotalsales.java

JAVA编程

public interface ComputeTotalSales {
	 public double totalSalesByYear();
}
class Television implements  ComputeTotalSales
{
	public double totalSalesByYear(){
		return 3000;
	}//实现totalSalesByYear()方法。
}
class Computer implements  ComputeTotalSales
{
	public double totalSalesByYear(){
		return 6000;
	}//实现totalSalesByYear()方法。
}
class Mobile implements  ComputeTotalSales
{
	public double totalSalesByYear(){
		return 2000;
	}//实现totalSalesByYear()方法。

}