Java tutorial
import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; public class Main { public static void main(String[] args) throws IOException { double[] dbuf = { 65.56, 66.89, 67.98, 68.82, 69.55, 70.37 }; FileOutputStream fos = new FileOutputStream("c:\\test.txt"); DataOutputStream dos = new DataOutputStream(fos); for (double d : dbuf) { dos.writeDouble(d); } dos.flush(); InputStream is = new FileInputStream("c:\\test.txt"); DataInputStream dis = new DataInputStream(is); while (dis.available() > 0) { double c = dis.readDouble(); System.out.print(c + " "); } } }