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NumberFormatException

3 replies on 1 page. Most recent reply: Apr 30, 2007 5:15 AM by Vincent O'Sullivan

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Jonathan Davids

Posts: 11
Nickname: jonat
Registered: Mar, 2007

NumberFormatException

Posted: Apr 29, 2007 11:50 PM

Hello Friends,

Please, I have a file which I want to read and it contains some data set in this format: 12.7891 4.5678 1.1234 30.97 etc. After reading and tokenizing the file, I wanted to store it in an array as double but it gives me a NumberFormatException error. What is the problem?

Some lines of the code


while (line != null) {
			StringTokenizer tokenizer = new StringTokenizer(line, "");
			int numOfTokens = tokenizer.countTokens();
			
			
			while (tokenizer.hasMoreTokens()) {
				if (numOfTokens <= 64) {
					for(int index = 0; index < Elements.length; index++) {
						String matx = tokenizer.nextToken();
					    
Elements[index] = Double.parseDouble(matx);              
					}
				}
				//System.out.println(tokenizer.nextToken());
				
			}
			line = br.readLine();
		}

Thanks,

Jonat

Vincent O'Sullivan

Posts: 724
Nickname: vincent
Registered: Nov, 2002

Re: NumberFormatException

Posted: Apr 30, 2007 1:12 AM

This line appears to be the problem:

StringTokenizer tokenizer = new StringTokenizer(line, "");

Your token should be a space not an empty String:

StringTokenizer tokenizer = new StringTokenizer(line, " ");

Vince.

Jonathan Davids

Posts: 11
Nickname: jonat
Registered: Mar, 2007

Re: NumberFormatException

Posted: Apr 30, 2007 1:58 AM

Thanks, that was a silly mistake that costed a lot of time.

Jonat

Vincent O'Sullivan

Posts: 724
Nickname: vincent
Registered: Nov, 2002

Re: NumberFormatException

Posted: Apr 30, 2007 5:15 AM

Your using an awful lot of nested loops to do something that should be simple. You might consider replacing it with something along the lines of:

int index = 0;
for (String value : line.split(" ", 64))
    Elements[index++] = Double.parseDouble(value);

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