Java has a bewildering array of I/O (input/output) routines. Many you can cascade together like Lego blocks to
create variants. Have a look at this essay on JDK 1.0.2
candidate methods or this essay on Java version 1.1 candidate
methods for the task at hand. The Java version 1.6 or later essay also shows suggested classes to
use when upgrading deprecated JDK (Java Development Kit) 1.0.2 methods.
I have also written an amanuensis Applet in Java, available with source code, to automatically generate Java source code for various
combinations of file type and data type. You can just experiment to learn from complete examples, or you can cut
and paste the code into your own applications.
The File I/O Amanuensis generates sample Java source code to read or write the console, a sequential file, a
random access file, a String, an array of characters, an array of bytes, URL (Uniform Resource Locator), HTTP (Hypertext Transfer Protocol) CGI (Common Gateway Interface) GET/POST, Socket or Pipe.
You can use them buffered, unbuffered or GZIP compressed. Java works with seven types of data in your files:
7 or 8-bitASCII (American Standard Code for Information Interchange) characters (plain or locale-encoded)
UTF (Unicode Transformation unit) 8-bit Unicode compressed character encoding.
Java is missing basic input routines. You have to roll your own with java.util.StringTokenizer, java.io.StreamTokenizer or readLine to split the
input up into strings, then use various conversion methods to convert to float, int etc.