Wanna skip exact number lines while reading a file file

Question

Hi all,
I would like to skip exact number of lines while reading a text file.
Let's say I wanna read this text file starting from line no N.
And so I need to skip from fist line to N-1th line.
Does anyone give me a way to do?
Pls with a sample code if possible coz I am not familiar much to java. :P

Answer 1

LineNumberReader class keeps track on line number for you. Sample that skip arg3 lines while copy arg1 file to arg2. Just sample no check, no cleanup.
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.LineNumberReader;
public class Main {
    public static void main(String... args) throws Exception {
        if (args.length != 3)
            throw new IllegalArgumentException("Arguments: infile outfile line_from");
        LineNumberReader reader = new LineNumberReader(
                new FileReader(new File(args[0])) );
        BufferedWriter writer = new BufferedWriter(
                new FileWriter(new File(args[1])) );
        int readFrom = Integer.valueOf(args[2]);
        // skip first lines
        while(reader.getLineNumber() < readFrom) {
            if (reader.readLine() == null)
                throw new IllegalArgumentException("Too few lines");
        // write tail
        String line = null;
        while((line = reader.readLine()) != null) {
            writer.write(line);
            writer.newLine();
        writer.flush();
}