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我試圖將所有輸出放到3個不同類中的一個JOption窗格中。目前，每當我打印電子書時，都會打印在他們自己的單獨對話框中，不得不一次一個地按OK，以循環瀏覽所有書籍。在多個類中的一個JOption窗格中打印
我需要將它們包含在一個對話框中，以及「編程方式」和電子書計數/成本部分。
我很好奇，如果我必須導入每個類。謝謝。
import javax.swing.JOptionPane; // dialog box
public class Ebook
{
private String author = "";
private String title = "";
private double price = 0.0;
private String isbn = "";
public Ebook(String author, String title, double price, String isbn) // ebook constructor
{
this.author = author;
this.title = title;
if (price > 0) // validate non-negative price
this.price = price;
else
{
this.price = 0.0;
System.out.println("Invalid price");
}
if (isbn.length() == 10 || isbn.length() == 13) // isbn length must be exactly 10 or 13
this.isbn = isbn;
else
this.isbn = "None";
}
public void setPrice(double price)
{
if (price < 0) // validate
{
System.out.println("Invalid price");
}
else
this.price = price;
}
public double getPrice()
{
return price;
}
public void setAuthor(String theAuthor)
{
this.author = theAuthor;
}
public String getAuthor()
{
return author;
}
public void setIsbn(String isbn)
{
if (isbn.length() == 10 || isbn.length() == 13) // validate
{
this.isbn = isbn;
}
else
isbn = "None";
}
public String getIsbn()
{
return isbn;
}
public void setTitle(String title)
{
this.title = title;
}
public String getTitle()
{
return title;
}
public String toString()
{
return String.format("Author: %s%nTitle: %s%nPrice: $%.1f%nISBN: %s%n",
author,title,price,isbn);
}
} // This was made by --
import javax.swing.JOptionPane; // dialog box
public class EbookLibrary
{
private int count = 0;
private double total_cost = 0.0;
Ebook[] ebooks = new Ebook[25]; // array of ebook objects
public EbookLibrary() // no argument constructor for ebooklibrary object in library test
{
}
public int getCount() // total number of ebooks
{
return count;
}
public double getCost() // sum of all ebooks
{
return total_cost;
}
public String toString() // formatted string with the number and cost of all ebooks
{
String message2 = String.format("Ebook count: %d%nTotal Cost: $%.1f", count, total_cost); // for dialog box
return message2;
}
public void addEbook(String author, String title, double price, String isbn) // adds ebooks to the array
{
if (count < 25) // dont walk off array
{
Ebook anEbook = new Ebook(author,title,price,isbn); // ebook object to be created when addEbook is called
ebooks[count] = anEbook;
total_cost += price; // total of all the books
String message = String.format("%s%n", ebooks[count]);
JOptionPane.showMessageDialog(null,message); // display books in dialog boxes
count++; // increment count each time
}
}
} // This was made by ------
import javax.swing.JOptionPane; // dialog box
public class EbookLibraryTest
{
public static void main(String[] args)
{
EbookLibrary aLibrary = new EbookLibrary(); // EbookLibrary object for calling addEbook
// ebook objects
aLibrary.addEbook("Blah", "What", 88.8, "1234567891")
aLibrary.addEbook("Thing Do", "What What", 45.0, "1234567891111");
aLibrary.addEbook("Stephen King","The Thing",1.1, "1234567891");
aLibrary.addEbook("Robert","A Title", -1.0, "1234567891"); // test invalid price, should return 0.0 and "invalid price"
aLibrary.addEbook("Tom","Bad Title", 33.1, "1234567891111");
aLibrary.addEbook("Bob", "FML and Other Acronyms", 25.0, "1"); // test ISBN value, should return "None"
aLibrary.getCount();
aLibrary.getCost();
String message = "Programmed by ---- ";
String message2 = String.format("%s%n", aLibrary.toString());
JOptionPane.showMessageDialog(null,message + "\n " + message2);
}
}