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File Reading

2 replies on 1 page. Most recent reply: Jul 6, 2012 11:51 PM by nikhil kadam

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Alan Franco

Posts: 1
Nickname: avfm
Registered: Dec, 2010

File Reading

Posted: Dec 8, 2010 11:15 PM

Can somebody explain to me how this code works. It's supposed to compare a text file line by line, but I'm not sure if it compares one file or two files. also, when I run it, it doesn't show any compiling errors, but it doesn't do anything.

import java.io.IOException;
import java.io.LineNumberReader;
import java.io.Reader;
import java.util.List;

public class Diff
{
public static void readersAsText(Reader r1, String name1, Reader r2, String name2,
List diffs)
throws IOException
{
LineNumberReader reader1 = new LineNumberReader(r1);
LineNumberReader reader2 = new LineNumberReader(r2);
String line1 = reader1.readLine();
String line2 = reader2.readLine();
while (line1 != null && line2 != null)
{
if (!line1.equals(line2))
{
diffs.add("File \"" + name1 + "\" and file \"" +
name2 + "\" differ at line " + reader1.getLineNumber() +
":" + "\n" + line1 + "\n" + line2);
break;
}
line1 = reader1.readLine();
line2 = reader2.readLine();
}
if (line1 == null && line2 != null)
diffs.add("File \"" + name2 + "\" has extra lines at line " +
reader2.getLineNumber() + ":\n" + line2);
if (line1 != null && line2 == null)
diffs.add("File \"" + name1 + "\" has extra lines at line " +
reader1.getLineNumber() + ":\n" + line1);
}
}

Vincent O'Sullivan

Posts: 724
Nickname: vincent
Registered: Nov, 2002

Re: File Reading

Posted: Dec 9, 2010 12:26 AM

Given that the class contains no "main" method, how are you running it?

nikhil kadam

Posts: 1
Nickname: nikalldway
Registered: Jul, 2012

Re: File Reading

Posted: Jul 6, 2012 11:51 PM

While taking the input from user u can write in file and print it at the same time u can read it from the file this is something i tried it .

public static void main(String[] args)throws Exception{
FileWriter fw = new FileWriter("C:\\batches\\helloo.txt);
BufferedWriter bw = new BufferedWriter(fw);
PrintWriter pw = new PrintWriter(bw,true);
ArrayList<String> S = new ArrayList<>();
InputStream is = System.in;
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
System.out.println("enter value");
String a = br.readLine();
while(!a.equals("end"))
{
S.add(a);
a=br.readLine();
}
System.out.println("printing value");
for(String v : S)
{
System.out.println(v);
pw.println(v);
}
}

FileReader fr = new FileReader("C:\\batches\\helloo.txt");
BufferedReader br = new BufferedReader(fr);
String s= br.readLine();
while(s!=null)
{
System.out.println(s);
s=br.readLine();
}

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