我的程序不會讀取我的文件

Question

我正在嘗試讀取一個文件，並打印出文件中有多少特定字，但它只是打印「0」。它正在工作，我改變了文件的內容，然後破壞了，現在它不起作用。

import javax.swing.*; 
import java.awt.*; 
import java.awt.event.*; 
import java.text.DecimalFormat; 
import java.io.*; 

public class TotalsGUI extends JFrame 
{ 
    private BagelPanel bagels;  
    private ToppingPanel toppings; 
    private CoffeePanel coffee;  
    private GreetingPanel banner; 
    private JPanel buttonPanel;  
    private JButton calcButton; 
    private JButton exitButton; 
    private final double TAX_RATE = 0.06; 
    int whiteCount = 0; 
    int wheatCount = 0; 

    public TotalsGUI() throws IOException 
    { 
     setTitle("Totals Calculator"); 

     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

     setLayout(new BorderLayout()); 

     banner = new GreetingPanel(); 
     bagels = new BagelPanel(); 

     buildButtonPanel(); 

     add(banner, BorderLayout.NORTH); 
     add(bagels, BorderLayout.WEST); 
     add(buttonPanel, BorderLayout.SOUTH); 

     pack(); 
     setVisible(true); 
    } 

    private void buildButtonPanel() 
    { 
     // Create a panel for the buttons. 
     buttonPanel = new JPanel(); 

     // Create the buttons. 
     calcButton = new JButton("Calculate"); 

     // Register the action listeners. 
     calcButton.addActionListener(new CalcButtonListener()); 

     // Add the buttons to the button panel. 
     buttonPanel.add(calcButton); 
    } 

    private class CalcButtonListener implements ActionListener 
    { 
     public void actionPerformed(ActionEvent e) 
     { 
     String fileName = "receipt.csv"; 
     String line = null; 

     try 
     { 
      FileReader fileReader = new FileReader(fileName); 

      BufferedReader bufferedReader = new BufferedReader(fileReader); 

      while((line = bufferedReader.readLine()) != null) 
      { 
       if (line.equalsIgnoreCase("White Bagel")) 
       { 
        whiteCount++; 
       } 
       else if (line.equalsIgnoreCase("Wheat Bagel")) 
       { 
        wheatCount++; 
       } 
      } 

      bufferedReader.close();    
     } 
     catch(FileNotFoundException ex) 
     { 
      System.out.println(
       "Unable to open file '" + 
       fileName + "'"); 
     } 
     catch(IOException ex) 
     { 
      System.out.println(
       "Error reading file '" 
       + fileName + "'"); 
     } 

     System.out.printf("White Bagels: %d\n", whiteCount); 
     System.out.printf("Wheat Bagels: %d", wheatCount); 
     } 
    } 

    public static void main(String[] args) throws IOException 
    { 
     new OrderCalculatorGUI(); 
    } 
} 

Answer 1

也許你會具有字左右空格。 你可以做一個下面的例子。

而不是

line.equalsIgnoreCase("White Bagel") 

嘗試使用

if(line.indexOf("White Bagel")>-1) 

，或者如果你想佔不區分大小寫然後

line.trim().equalsIgnoreCase("White Bagel") 

我選擇選項1，如果我不考慮區分大小寫

Answer 2

您可以使用java.util.Scanner類從任何輸入流中分離令牌中的數據。您應該訪問此鏈接，掃描儀的工作原理

http://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html