[4337] in java-interest
Bug in StreamTokenizer!
daemon@ATHENA.MIT.EDU (Glenn Maughan)
Tue Dec 19 07:57:45 1995
Date: Tue, 19 Dec 1995 17:04:14 +1100
From: glennm@optimation.com.au (Glenn Maughan)
To: java-interest@java.sun.com
Cc: grege@optimation.com.au
We have found strange behaviour with the StreamTokenizer class when using pipes or redirection.
The following example reads a line with a <word> <number> <number> and prints out each value read.
When reading from stdin (ie, the keyboard) the routine works correctly. However, when
reading from a pipe or a redirected file the parsing of numbers does not work correctly. For example,
if the first line to read is:
A 123 456
the parse will read "A" as the label correctly. But then it will read "1" as the first number and
"2" as the second number instead of "123" and "456" respectively. This only happens when reading
from a pipe or redirection:
$ java TestTokenizer < numbers.txt
or
$ cat numbers.txt | java TestTokenizer
Here is the code. Can anyone see what the problem is?
Thanks,
Glenn.
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import java.io.*;
class TestTokenizer {
public void run() {
StreamTokenizer tokenizer = new StreamTokenizer(System.in);
int newToken;
String newLabel;
double newDouble;
// set up the tokenizer
tokenizer.parseNumbers();
// prime the loop with the first token
try {
newToken = tokenizer.nextToken();
while (newToken != tokenizer.TT_EOF) {
// first token should be a label
if (newToken == tokenizer.TT_WORD) {
newLabel = tokenizer.sval;
System.out.println("Label: " + newLabel);
// get the first value
newToken = tokenizer.nextToken();
if (newToken == tokenizer.TT_NUMBER) {
newDouble = tokenizer.nval;
System.out.println("First value: " + newDouble);
// get the second value
newToken = tokenizer.nextToken();
if (newToken == tokenizer.TT_NUMBER) {
newDouble = tokenizer.nval;
System.out.println("Second value: " + newDouble);
}
}
}
newToken = tokenizer.nextToken();
}
} catch (IOException e) {}
}
public static void main(String args[]) {
TestTokenizer t = new TestTokenizer();
t.run();
}
}
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