title: Java Fastest way to read through text file with 2 million lines
body: <p>Currently I am using scanner/filereader and using while hasnextline. I think this method is not highly efficient. Is there any other method to read file with the similar functionality of this? </p>
  
  <pre><code>public void Read(String file) {
          Scanner sc = null;
  
  
          try {
              sc = new Scanner(new FileReader(file));
  
              while (sc.hasNextLine()) {
                  String text = sc.nextLine();
                  String[] file_Array = text.split(" ", 3);
  
                  if (file_Array[0].equalsIgnoreCase("case")) {
                      //do something
                  } else if (file_Array[0].equalsIgnoreCase("object")) {
                      //do something
                  } else if (file_Array[0].equalsIgnoreCase("classes")) {
                      //do something
                  } else if (file_Array[0].equalsIgnoreCase("function")) {
                      //do something
                  } 
                  else if (file_Array[0].equalsIgnoreCase("ignore")) {
                      //do something
                  }
                  else if (file_Array[0].equalsIgnoreCase("display")) {
                      //do something
                  }
              }
  
          } catch (FileNotFoundException e) {
              System.out.println("Input file " + file + " not found");
              System.exit(1);
          } finally {
              sc.close();
          }
      }
  </code></pre>