Java tutorial
import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.util.Arrays; public class Main { public static void main(String[] args) throws Exception { ObjectOutputStream out = new ObjectOutputStream( new BufferedOutputStream(new FileOutputStream("file.data"))); out.writeDouble(1.234); out.close(); ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(new FileInputStream("file.data"))); byte[] byteArray = new byte[10]; in.read(byteArray); System.out.println(Arrays.toString(byteArray)); in.close(); } }