File and Streams in Java : Complete Tutorial

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Persistent data is stored in files, which are stored on hard disks, flash drives, etc. This website discusses the following ways to access a file:

• Sequentially
• Randomly

A file itself is just a bunch of related records, companies payroll, stocks, etc. Files themselves can grow to a very large size normally determined by the operating system. There are many ways of organizing records in a file, the common type is called sequential file in which records are typically stored in order by the record-key field. In some instanaces records could be stored in a database but even a database stores its data in files.
File and Streams
Java views each file as a sequential stream of bytes, each file ends with either an end-of-file marker or at a specific byte number record. Three streams are automatically created when we begin executing a Java program

• System.in  - standard input stream object (normally the keyboard or mouse)
• System.out - standard output stream object (normally the display)
• System.err - standard error stream object (normally the display)

The java.io package contains many classes and interfaces that relate to Java I/O a portion of it is below  more...