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reading from file
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I'm really knew to this programming thing, and need a little help. My objective is to read data from a file like
2 2
0 0 wwdd
0 1 wwxd
1 0 ddwd
1 1 ddww
I have read the file line by line, but I do not know how to store the individual values. The first two numbers represent the length and width of the block. The rest are just coordinates.
Any ideas? The code should be flexible in case the row and columns change.
2 2
0 0 wwdd
0 1 wwxd
1 0 ddwd
1 1 ddww
I have read the file line by line, but I do not know how to store the individual values. The first two numbers represent the length and width of the block. The rest are just coordinates.
Any ideas? The code should be flexible in case the row and columns change.
import java.io.*;
import java.util.*;
class FileRead
{
public static void main(String args[])
{
String record = null;
try{
// Open the file that is the first
// command line parameter
FileInputStream fstream = new FileInputStream("h.txt");
// Get the object of DataInputStream
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String strLine;
while ((strLine = br.readLine()) != null)
{
String delims =" " ; // DEFINES CHARACTER BEING USED
StringTokenizer st = new StringTokenizer(strLine, delims);
int frow = Integer.parseInt(st.nextToken());
int fcol = Integer.parseInt(st.nextToken());
System.err.println(frow);
System.out.println(strLine);
}
}catch (Exception e){//Catch exception if any
System.err.println("Error: " + e.getMessage());
}
}
}
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Join Date: Dec 2007
Posts: 1,678
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Solved Threads: 226
Store them where? Because you are already storing them in varables:
Where you want them to be stored? You can put these variables wherever you want. Perhaps create a new class for each line and put those values in the class and then store each class in a Vector
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The problem i am having is getting the letters. I tried char at, but it won't give me any output. I want each letter to be stored separately.
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Join Date: May 2007
Posts: 4,483
Reputation:
Solved Threads: 515
Use String.split(), which will return an array of Strings that result from the split on your expression. You can then work with the characters in the string from that portion separately.
Teacher wants us to use tokenize. I tried the split thing though and it worked, but he won't accept it.
hi dakrous
i read you problem but there's something that i don't understand.
2 2
0 0 wwdd
0 1 wwxd
1 0 ddwd
1 1 ddww
Q. The 2 2 is the length and width of your block and the remaining is the input. Do you have only to print the remaining output or stored it in an array?????
well you started the code well but in the middle you mess it up.
first thing: while getting the frow and fcol, why did you put it in a loop, only once you have to get this, you have to put it outside the loop.
second thing: if you have only to print the output, then print it in the while loop or if u have to save it and then print it, create an array of the size of your block and do it there
some changes:
String delims =" " ; // DEFINES CHARACTER BEING USED
strLine = br.readLine();
StringTokenizer st = new StringTokenizer(strLine, delims);
int frow = Integer.parseInt(st.nextToken());
int fcol = Integer.parseInt(st.nextToken());
System.out.println("Length" +frow+"Width:"+fcol);
while ((strLine = br.readLine()) != null)
{
System.out.println(strLine); //or save it in the array here
}
hope that this helps.
i read you problem but there's something that i don't understand.
2 2
0 0 wwdd
0 1 wwxd
1 0 ddwd
1 1 ddww
Q. The 2 2 is the length and width of your block and the remaining is the input. Do you have only to print the remaining output or stored it in an array?????
well you started the code well but in the middle you mess it up.
first thing: while getting the frow and fcol, why did you put it in a loop, only once you have to get this, you have to put it outside the loop.
second thing: if you have only to print the output, then print it in the while loop or if u have to save it and then print it, create an array of the size of your block and do it there
some changes:
String delims =" " ; // DEFINES CHARACTER BEING USED
strLine = br.readLine();
StringTokenizer st = new StringTokenizer(strLine, delims);
int frow = Integer.parseInt(st.nextToken());
int fcol = Integer.parseInt(st.nextToken());
System.out.println("Length" +frow+"Width:"+fcol);
while ((strLine = br.readLine()) != null)
{
System.out.println(strLine); //or save it in the array here
}
hope that this helps.
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Join Date: May 2007
Posts: 4,483
Reputation:
Solved Threads: 515
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Originally Posted by dakrous 
Teacher wants us to use tokenize. I tried the split thing though and it worked, but he won't accept it.
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StringTokenizer is a legacy class that is retained for compatibility reasons although its use is discouraged in new code. It is recommended that anyone seeking this functionality use the split method of String or the java.util.regex package instead.
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