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7.8

while loop in Java doesn't work when line is split using split method

Asked by cmlane08 in Java Server Pages (JSP), Java Programming Language, New to Java Programming

Tags: java, jsp, programming

I have a nested while loop that works perfectly when I'm only reading one column per line. I am using the BufferedReader to read a line from a text file and then I'm looping through each token in a StringTokener object.

It works great when there is only one column in the file. For instance the text file has the values:

red
green
blue

In this scenario the code below will read each line and then assign the value of each row to the variable "color". I can then pass this value to another method and the loop continues until the end. It then returns to the calling method and outputs the counter variable values as intended.

The problem is that now my text file has two columns so it's as follows:

red, pink
green, yellow
blue, purple

So now I need to pass two variables to the paintColors() method in the nested while loop.

Instead of:

color = st.nextToken();

I need to split the token as follows:

String[] columnValues = line.split(",");

color = columnValues[0];
color2 = columnValues[1];

because now I have two values that must be assigned to variables and passed to the other method. When I do this however, I encounter an indefinite loop and the while loop won't read the next line. It also doesn't finish so that my totalItems and changeCounter counter won't output. I don't think it's important to delve into details on what the paintColors() method does. Then counter works fine when there's only 1 column in the colorList file so I'm certain that the method is returning properly.

I simply want to do what I did previously with only 1 column but now I have two columns. I will post the code that works first and then the code that doesn't work when the second value is added.

Please note that the "colorList" file first contained the following:

red
green
blue

Then I added a second column as follows and it stopped working:

red, pink
green, yellow
blue, purple

Thanks!!

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             private static void countColors() {
 
try{
        BufferedReader bufRdr = new BufferedReader(new FileReader("C:\\colorList..txt"));
 
        String line = null;
 
        int totalItems=0;
        int changeCount=0;
 
        while((line = bufRdr.readline()) != null)
        {
               StringTokenizer st = new StringTokenizer(line, ",");
               
               String color = null;
                    
                      while (st.hasMoreTokens())
                      {
                            color = st.nextToken();
 
                            totalItems++;
                                
                            try {
                                     int returnCount = paintColors(color);
 
                                     changeCount = changeCount + returnCount;
                                 
                                 } catch (Exception e) {
 
                                       System.out.println("ERR: " + e.getMessage());
                                  }
                   }
 
            }
            
              System.out.println("\nProcess Completed !!");
          
              System.out.println("\nTotal Color Count: " + totalItems);
 
              System.out.println("Total Content Updated Count: " + changeCount);
     
     } catch (Exception e) {
 
              System.out.println("ERR: " + e.getMessage());
 
              }
}

           
         

Attachments:

colorList.txt (20 bytes) (File Type Details)

first colorList file with only 1 column

20091111-EE-VQP-92 - Hierarchy / EE_QW_3_20080625

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while loop in Java doesn't work when line is split using split method

Asked by cmlane08 in Java Server Pages (JSP), Java Programming Language, New to Java Programming

Tags: java, jsp, programming

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