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Java Forum / First Aid / January 2006read file as object
hello! Iam wondering if there is a way to read content of the file as object and put it in arraylist. then have possibility to cast elements of object to char, or other primitiv data type. Thanx in advance ________________________ > hello! > > Iam wondering if there is a way to read content of the file as object > and put it in arraylist. > then have possibility to cast elements of object to char, or other > primitiv data type. It all depends on the contents of the file. If you used an ObjectOutputStream to write Character objects to the file, you can read them back with an ObjectInputStream, and get the char value with Character:charValue(). but if not? I mean if file was created some other way, can one read byts as object and cat it to char. I want to make abstract io class for the application, so I don't have to care then I read file what it contains. but I can extend it to cast byts (for ex) to char or int or what ever >> hello! >> [quoted text clipped - 7 lines] > them back with an ObjectInputStream, and get the char value with > Character:charValue().  SignatureThanx in advance ________________________ > but if not? I mean if file was created some other way, > can one read byts as object and cat it to char. > I want to make abstract io class for the application, so I don't have to > care then I read file what it contains. > but I can extend it to cast byts (for ex) to char or int or what ever One could read the file directly as a sequence of chars, rather than reading it as objects and then casting to char. See http://java.sun.com/j2se/1.5.0/docs/api/java/io/Reader.html#read() One could also read the file directly as a sequence of bytes. See http://java.sun.com/j2se/1.5.0/docs/api/java/io/FileInputStream.html#read() - Oliver well, thanx for pointing it out, but my question can I read bytes to arraylist, and later or if I wanto cast them to char and wrap as objects? and how do I cast & wrap in that case? shoud one take 2 byts at the time? for char in this case? >> but if not? I mean if file was created some other way, >> can one read byts as object and cat it to char. [quoted text clipped - 10 lines] > > - Oliver SignatureThanx in advance ________________________ > well, thanx for pointing it out, > but my question can I read bytes to arraylist, and later or > if I wanto cast them to char and wrap as objects? > and how do I cast & wrap in that case? shoud one take 2 byts at the time? > for char in this case? I'm not sure I understand your questions, so I'm going to make some statements, and hopefully these statements will contain the information you want. You can read the bytes one at a time, and put them into an ArrayList of Byte objects, or you could read the bytes into an array of bytes (e.g. byte[]). Given a Byte object, you can get its corresponding byte value. Given a byte, you can create a corresponding Byte object. Given a Character object, you can get its corresponding char value. Given a char, you can create a corresponding Character object. To convert between bytes and chars (or Bytes and Characters), you need to use an encoding, e.g. UTF-8, ASCII, etc. Not all encodings map 2 bytes to 1 character. - Oliver Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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