Question

请帮助，我正在尝试根据从输入文件中读取的数量来计算书籍总数。我试图计算书籍的总数，但是现在我的代码只是生成它从文件中读取的最后一个数量，作为totalBooks的总数。我不确定我做错了什么，但任何指导都会非常感激。

这是我的......

注意：我尝试修复的程序部分位于注释// Calculate Total Books

之下

import java.util.Scanner;
import java.io.File;
import java.io.IOException;

public class BookstoreInventory
{
public static void main(String[] args)throws IOException
{
//Vaiable declartions
int edition, quanity;
double pricePerBook;
String isbn, author, title, publisherCode;

//Open the file and set delimiters
File file = new File("inventory.txt");
Scanner inputFile = new Scanner(file);
inputFile.useDelimiter("_|/|\\r?\\n");

//read from the file
while (inputFile.hasNext())
{
  isbn = inputFile.next();
    System.out.println(formatISBN(isbn)); //Need to move at end
  author = inputFile.next();
    System.out.println(getLastName(author));  //need to remove at end
  title = inputFile.next();
    System.out.println(truncateTitle(title));  //need to remove at end
  edition = inputFile.nextInt();
    System.out.println(edition(edition));   //need to remove at end
  publisherCode = inputFile.next();
    System.out.println(publisher(publisherCode));   //need to remove at end
  quanity = inputFile.nextInt();
    System.out.println(quanity);     //need to remove at end
  pricePerBook = inputFile.nextDouble();
    System.out.println("$" + pricePerBook);   //need to remove at end

  //Calculate Total Books
  int totalBooks = 0;
  totalBooks += quanity;
  System.out.println("Total books: " + totalBooks);
}

//Close the flie
inputFile.close();
}

Answer 1

您需要使用public void toggleDirection(){ CustomMessageTreeNode currentSelectedNode = (CustomMessageTreeNode) tcBuilderTree.getLastSelectedPathComponent(); Message toggleMessage=currentSelectedNode.getMessage(); tcBuilderTree.setCellRenderer(new DefaultTreeCellRenderer(){ @Override public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean isLeaf, int row, boolean focused) { Component c = super.getTreeCellRendererComponent(tree, value, selected, expanded, isLeaf, row, focused); if(value instanceof CustomMessageTreeNode){ String currentDirection=toggleMessage.getMsgDirection(); if(currentDirection.equalsIgnoreCase("In")){ toggleMessage.setMsgDirection("Out"); System.out.println("Direction changed as : Out"); setIcon(toggleMessage.getMessageDirectionIcon()); return c; } if(currentDirection.equalsIgnoreCase("Out")){ toggleMessage.setMsgDirection("In"); System.out.println("Direction changed as : In"); setIcon(toggleMessage.getMessageDirectionIcon()); return c; } } return c; } }); }

您必须计算总数量，因此您需要通过添加下一个数量来更新以前的数量，而不是替换

Java全书计算

1 个答案: