一直不知道哪里出问题
不太会改
请各位大大帮我

import java.util.Scanner;

class Book{
private String name;
private String author;
private String publisher;
private int price;

Book(){

}

Book(String name, String author, String publisher, int price){
this.name = name;
this.author = author;
this.publisher = publisher;
this.price = price;
}

public String toString(){
return "书名：" + this.name + "\n作者：" + this.author +
"\n出版社：" + this.publisher + "\n订价：" + this.price;

}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getAuthor() {
return author;
}

public void setAuthor(String author) {
this.author = author;
}

public String getPublisher() {
return publisher;
}

public void setPublisher(String publisher) {
this.publisher = publisher;
}

public int getPrice() {
return price;
}

public void setPrice(int price) {
this.price = price;
}

public double getSellPrice(){
Calculator calculator = new Calculator();
double price = (double)this.price;
return calculator.calculate(price, 0.8);
}
}
class ComBook extends Book{
boolean hasDisc;

String hasDisc(){
return this.hasDisc==true?"附光碟":"没光碟";
}
void setHasDisc(boolean hasDisc){
this.hasDisc = hasDisc;
}
ComBook(){

}
ComBook(String name, String author, String publisher,
int price, boolean hasDisc){
super( name, author, publisher, price);
this.hasDisc = hasDisc;
}
}

class Comic extends Book{
boolean isComic;

String isComic(){
return this.isComic==true?"书":"漫画书";
}
void setHasDisc(boolean isComic){
this.isComic = isComic;
}


class BookShop{
private ComBook[] comBook = new ComBook;
BookShop(){
comBook = new ComBook("资料结构\t","曾志轩\t","碁峰文化\t",500,true);
comBook = new ComBook("J2EE\t\t\t","杨泰升\t","博硕文化\t",380,true);
comBook = new Comic("火影忍者\t","岸本齐史\t","东立",80,true);
comBook = new ComBook("MacOSX 10.5\t\t","施威铭研究室","旗标\t",560,true);
comBook = new Comic("灌篮高手\t","井上雄彦\t","东立",80,true);
comBook = new ComBook("Java程式设计艺术\t","Deitel\t","全华图书\t",650,true);

}
public String toString(){
String result = "";
for(int i=0;i<comBook.length;i++){
result += "("+(i ..

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