Read Large File

ReadFile.java

import java.io.*
/*
  Given a One GB file that prints statuses, determine a faster way to read the file and determine the current status.
  To simplify, the file will only contain nothing, or a Status with a color, as well as a time (here just given as
  an integer from 0 to the Length of the File - 1)
  
  Another scenario could be that we have two files, one at one snapshot in time and one at a later snapshot in time,
  with additional statuses added since the reading of the first file.
  
  A third scenario has a status omitted, so a default status must be put if that status does not show up in the logs.
*/
  
  
public class ReadFile {

  public static void main(String[] args) {
    File file  = generate1GbFile();
    Status status =  new Status();
    long startTime = System.currentTimeMillis();
    readFileAndUpdateStatus(file, status);
    long endTime = System.currentTimeMillis();
    System.out.println("Time elapsed: " + (endTime - startTime));
    System.out.println(status.toString());
    file.delete();
  }
  
  private void readFileAndUpdateStatus(File file, Status status) {
    FileReader fileReader = new FileReader(file);
    BufferedReader bufferedReader = new BufferedReader(fileReader);
    String line;
    while ((line = bufferedReader.readLine()) != null) {
      //TODO make reading better? faster? stronger?
      if(line.contains("Status 1")) {
        status.setStatusOne(line.split(":")[1].trim());
      } else if(line.contains("Status 2")) {
        status.setStatusTwo(line.split(":")[1].trim());
      } else if(line.contains("Status 3")) {
        status.setStatusThree(line.split(":")[1].trim());
      }
    }
    fileReader.close();
  }

  private File generate1GbFile() {     
    RandomAccessFile f = new RandomAccessFile("t", "rw");
    for(int i = 0; i < (1024*1024*1024); i++) {
      //TODO make status random
       f.writeChars(i + " Status 1: GREEN");
       f.writeChars(i + " Status 2: RED");
       f.writeChars(i + " Status 3: YELLOW");
    }
    return f;
  }

  private class Status {
    String status1;
    String status2;
    String status3;
    
    private void setStatusOne(String status) {
      this.status1 = status;
    }
    
    private void setStatusTwo(String status) {
      this.status2 = status;
    }
    
    private void setStatusThree(String status) {
      this.status3 = status;
    }

    public String toString() {
     return "Status 1 = " + status1 " | Status 2 = " + status2 + " Status 3 = " status3; 
    }
  }
  
}