Bit of a problem need some help please

Question

import java.io.*;
class IO
public static void main(String args[])
String sOutString = "";
int iRecordLength = 0;
int iWork=0;
int[] array = new int[21];
try
// creat input file, buffer.
FileInputStream fis = new FileInputStream("myInFile.txt");
BufferedInputStream bis = new BufferedInputStream(fis);
DataInputStream dis = new DataInputStream(bis);
// Create an output
String fileName = "myOutFile.txt";
File myOutFile = new File(fileName);
FileOutputStream outStream = new FileOutputStream(myOutFile);
PrintWriter out = new PrintWriter(outStream);
out.println ("This is the header record");
String record = null;
while ( (record=dis.readLine() ) != null )
String sTest = "";
sTest = record;
if (iWork==0)
iRecordLength = sTest.length();
sOutString = sTest.substring(0, iRecordLength);
System.out.println(sOutString);
out.println (sOutString);
System.out.println(sTest.substring(0, 5));
out.close();
// System.out.print ("\n");
catch (IOException e)
System.err.println("File Error; " + e);
System.out.println("");
System.out.println("Ended");
System.exit(0);
// use get chars w substring
Ok theres my code what im trying to do is substring my in file so that it will take a section of it out and put the rest in
an out file. The problem is that my in file has a few lines and i do not know how to dubstrin g different linec can anyone help me?

Answer 1

Well,
I took the liberty of rewriting your code to make it readable, and expurgated most of the carp... what you've got there boils down to a really complicated-azzed implementation of cat.
package forums;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.PrintWriter;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
class FileCatterator {
  public static void main(String args[]) {
    BufferedReader input = null;
    PrintWriter output = null;
    try {
      input = new BufferedReader(new FileReader("FileCatterator.java"));
      output = new PrintWriter(new BufferedWriter(new FileWriter("FileCatterator.txt")));
      String line = null;
      while ( (line=input.readLine()) != null ) {
        int len = line.length();
        String substring = line.substring(0, len);
        System.out.println(substring);
        output.println(substring);
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      if(input!=null)try{input.close();}catch(IOException e){e.printStackTrace();}
      if(output!=null)output.close();
}The substring doesn't do anything.
Now, What did you need it to do? Print the first so-many characters of each line or something?