M11: File Input and Output

absolute path

complete details needed to locate a file or folder starting from the root

relative path

details needed to locate a file or folder starting from the current location

System.in

The "standard" input stream, typically the console on command-line programs.

System.out

The "standard" output stream, typically the console on command-line programs.

System.err

The "standard" error output stream, typically also the console on command-line programs, but may be shown in a different color.

format string

The first argument to printf that specifies how to format the output.

format specifier

A special code that begins with a percent sign and specifies the data type and format of the corresponding value.

flushing output

When writing output from a program it may be cached and not completely written to disk until the program flushes or closes the stream. For example to make sure output from PrintWriter is actually written, make sure to close it.

IOException

A type of Run-time error or exception that can occur while performing certain Input or Output operations [checked]

FileNotFoundException

Signals that the attempt to open a file denoted by a specified path name has failed [checked]

file input

data read from a file

file output

data written to a file