java i/o... need help reading values from file

[morc]

hey i need to read the values from some log files.

the format is like this :

Time Price
082257 0.0295
090110 0.03
090200 0.03
091503 0.0305
091504 0.0305
091514 0.0305
091522 0.0305
091917 0.0305
092203 0.0305

Does anybody have any suggestion of how id iterate through all these
price values to find the highest and lowest??
I will also be needing to find price values for certain times. but
mainly my focus right now is just to retrieve the high and low. If
anyone has any ideas how to go about his it would be greatly
appreciated if you would post

thanks alot
-morc

 

[visenger]

Hello,

just a hint how to read some data from a file:
http://java.sun.com/docs/books/tutorial/essential/io/ex5/DataIODemo.java

You can collect price in an array and then you must implement the
method that computes highest and lowest price.

 

[visenger]

http://java.sun.com/docs/books/tutorial/essential/io/dataIO.html

 

[Roedy Green]

092203 0.0305

Since they are in fixed columns, you could use substring to extract
them, or approximately extract them, then trim. Read the file with a
BufferedReader
http://mindprod.com/jgloss/string.html
see http://mindprod.com/applets/fileio.html

You could use a StringTokenizer trained to consider space as a
discardable separator.
http://mindprod.com/jgloss/stringtokenizer.html

You could use a regex split on space.
http://mindprod.com/jgloss/regex.html

you could use a column-mode text editor to insert a comma down the
middle and then read them as a CSV file.
http://mindprod.com/jgloss/csv.html

 

[morc]

hey thanks for those references. i tried using what visen gave me.
Heres the code:

DataInputStream in = new DataInputStream(new
FileInputStream("C:/marc_repository/USXPdata.txt"));
char ch = in.readChar();
System.out.println(ch);

i began to do that just to test it but for some reason. The only values
i get are "?".
I treid the deprecated readLine and it read the first line showing that
i was connected tot he file.
Does anybody know how come its reading question marks??
and also does anyone know of a way to skip the first line?

Thanks again for the help.
-morc

 

[Roedy Green]

i began to do that just to test it but for some reason. The only values
i get are "?".

readChar is expecting 16-bit chars. If your stream is encoded 8-bit
bytes you need to use an InputStreamReader.

Dump the first 16 bytes of the file in hex and tell me what you think
it means and I can be more specific about the classes you need to read
it.

http://mindprod.com/applets/fileio.html
http://mindprod.com/jgloss/hex.html