booktype.java

来自「构建网上购书最优联盟 此篇文章重在构建囊括最多变量因素的网上购书联盟。计」· Java 代码 · 共 27 行

package tomato;


abstract class BookType {
  
  private Book d_book;
   
  public BookType( ){}
  
  public Book GetBook(){
    
    return d_book;
  }
  
  public void SetBook(Book book){
    
    d_book = book;	
  }
  
  public abstract double Discount(Book book);
  
  public static void main(String[]args){
         
  	
  }
  
}