不兼容的类型可能有损从双转换为int

即时尝试添加一个总计到我的对话框，但我收到一条错误消息，我似乎无法修复它。如果我尝试将Grand Total放在我的for循环中，它只会在对话框中打印出5次。我确实需要最后有总计打印对话框不兼容的类型可能有损从双转换为int

import javax.swing. JOptionPane; 

public class BookTest 
{ 
    public static void main(String args[]) 
    { 
     double charge; 
     double grandTotal= 0; 


     String dataArray[][] = {{"Abraham Lincoln Vampire Hunter","Grahame-Smith","978-0446563079","13.99", "Haper", "NY"}, 
        {"Frankenstein","Shelley","978-0486282114","7.99","Pearson", "TX"}, 
        {"Dracula","Stoker","978-0486411095","5.99","Double Day", "CA"}, 
        {"Curse of the Wolfman"," Hageman","B00381AKHG","10.59","Harper", "NY"}, 
        {"The Mummy","Rice","978-0345369949","7.99","Nelson", "GA"}}; 




     Book bookArray[] = new Book[dataArray.length]; 

     int quantityArray[] = {12, 3, 7, 23, 5}; 

     for (int i = 0; i < dataArray.length; i++) 
     { 
      bookArray[i] = new Book(dataArray[i][0], dataArray[i][1], dataArray[i][2], 
       Double.parseDouble(dataArray[i][3]), new Publisher(dataArray[i][4], dataArray[i][5])); 
     } 

     String msg = " "; 



     for (int i = 0; i < bookArray.length; i++) 
     { 

      charge = bookArray[i].calculateTotal(quantityArray[i]); 

      grandTotal = charge + grandTotal; 

      msg += String.format(" %s, %s, $%.2f\n", bookArray[i].getTitle(), bookArray[i].getIsbn(), charge); 


     } 


     JOptionPane.showMessageDialog(null, msg, "Grand Total $%.2f ", grandTotal); // 

    } 

}

来源

2015-04-15 Student214

您提到了一条错误消息：消息是什么，它表示哪条线？ – deltab

你试图通过grandTotal为showMessageDialog消息类型。

我怀疑你的意思是像下面这样：

JOptionPane.showMessageDialog(
    null, msg, 
    String.format("Grand Total $%.2f", grandTotal), 
    JOptionPane.INFORMATION_MESSAGE 
);

另见"How to Make Dialogs"。

来源

2015-04-15 22:25:52 Radiodef

我收到一个错误sayng没有找到合适的方法 – Student214

JOptionPane.showMessageDialog（null，msg，String.format（“Grand Total $％。2f”，grandTotal））;我不认为它是我的逗号位置？ – Student214

是的，对不起，请参阅我的编辑。 – Radiodef

不兼容的类型可能有损从双转换为int

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