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Thread: Reading Big File analysis

  1. #1
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    Default Reading Big File analysis

    I was searching the prohram to read big file (i.e. size more than 4gb). I got the below program and it reads big files. They say that the program doesn't read the whole file at once. I would like to understand how its achieved in below program
    public class BigFile implements Iterable<String>
    {
    private BufferedReader _reader;

    public BigFile(String filePath) throws Exception
    {
    _reader = new BufferedReader(new FileReader(filePath));
    }

    public void Close()
    {
    try
    {
    _reader.close();
    }
    catch (Exception ex) {}
    }

    public Iterator<String> iterator()
    {
    return new FileIterator();
    }

    private class FileIterator implements Iterator<String>
    {
    private String _currentLine;

    public boolean hasNext()
    {
    try
    {
    _currentLine = _reader.readLine();
    }
    catch (Exception ex)
    {
    _currentLine = null;
    ex.printStackTrace();
    }

    return _currentLine != null;
    }

    public String next()
    {
    return _currentLine;
    }

    public void remove()
    {
    }
    }
    }

    Here’s how you might use it:
    BigFile file = new BigFile("C:\Temp\BigFile.txt");

    for (String line : file)
    System.out.println(line);


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Reading Big File analysis

    Please Edit your post and wrap your code with[code=java]<YOUR CODE HERE>[/code] to get highlighting
    the program doesn't read the whole file at once
    Unless the file has only one line, then the program reads the file one line at a time using the readLine() method.

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