已解決可否解說一下這個程序是怎麼運行的？

提問者：街角京裏街  |  瀏覽次  |  提問時間：2017-03-16  |  回答數量：1

interface ComputeTotalSales{public double totalSalesByYear( );}class Television implementsComputeTotalSales{ public double totalSalesByYear( ){ return 400; } // 實現totalSalesByYear( )方法}class Computer implementsComputeTotalSales{public double totalSalesByYear( ){return 1000; }// 實現totalSalesByYear( )方法}class Mobile implementsComputeTotalSales{public double totalSalesByYear( ){return 2000; }// 實現totalSalesByYear( )方法}class Shop{ComputeTotalSales[ ] goods; double totalSales=0; Shop(ComputeTotalSal