Re: Is any IO format reader in Java?
On Aug 28, 5:40 pm, RC <raymond.c...@nospam.noaa.gov> wrote:
in java.io.*;
In PrintWriter and PrintStream classes
they both have two format(...) methods.
So I can write similar like C/C++
printf, fprintf and sprintf in format like %5.1f.
But I can't find an IO class has format reader
similar to C/C++
scanf, fscanf and sscanf
I have some input data look like
" 0.1-10.2" (two spaces at the front).
They are two float numbers 0.1 and -10.2 (NOT 0.1 minus 10.2)!
The best way to read this is read them in format "%5.1f%5.1f"
Fixed field-width with no separating whitespace? That's ugly to do in
Java. At least one guaranteed whitespace or any other separator in
between and you could use Scanner. But without a separator you either
need to look for a third-party library, try to make sense out of
DecimalFormat.parse() and accompanying pattern junk, or do some good
old coding, like it follows.
int fieldWidths[] = { 5, 5 };
BuffredReader in = ...
....
String line;
while((line = in.readLine()) != null) {
int start = 0;
for(int width: fieldWiths) {
int end = start + width;
String field = line.substring(start, end);
if(field.length() != width) {
// ups, input to short
}
double value = Double.parseDouble(field);
// do something with the value
start = end;
}
}
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