A filter connects to an InputStream or OutputStream and performs some transformation on the data : Stream « File « SCJP

1. SCJP
2. File
3. Stream

A DataInputStream object interprets a stream of bytes from the FileInputStream as double primitive values

import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.IOException;

public class MainClass {
  public static void main(String[] argv) {
    double d[] = new double[100];
    try {
      FileInputStream fis = new FileInputStream("mydata.bin");
      DataInputStream dis = new DataInputStream(fis);
      for (int i = 0; i < 100; i++) {
        d[i] = dis.readDouble();
      }
    } catch (IOException e) {
    }

  }
}