File Input and Output (Midterms)

• Types of Storage Device

  Volatile Storage and Non-volatile Storage
• Difference between volatile and non-volatile storage

  volatile is temporary

  non-volatile is permanent
• Volatile values (stored in variables)


  are lost when the computer loses its power.
• The _________ is being used when a Java program stores a value in a variable.

  Random Access Memory (RAM)
• A ________ that is saved on a disk uses a non-volatile storage

  Java program
• A java program that is saved on a disk uses a _____

  non-volatile storage
• is a collection of data stored on a non-volatile device

  Computer file
• computer file is a collection of data stored on a _____

  non-volatile device.
• Categories of file:


  text file

  binary file
• consists of data that can be read in a text editor

  text file
• Data in a ______ is encoded using a scheme.

  text file
• Data in a text file is encoded using a _____

  scheme
• Most common schemes in text file

  ASCII

  Unicode
• program files and application files are examples under

  text file
• example of text file

  program files and application files.
• Data that is not encoded as text

  binary file
• contents that cannot be understood by viewing them in a text editor

  binary file
• examples of ____ is images, music, and the .class extension files

  binary file
• examples of binary of file

  images

  music

  .class extension files
• Common characteristics of text and binary files

  size

  name

  date and time of creation.
• where does the permanent files stored?


  main and root directory
• folder and directories are used to organize _____

  stored files
• are used to organize stored files

  folder and directories
• what is in the path?


  complete list of the disk drive

  the hierarchy of directories in which the file is located
• the complete list of the disk driveand the hierarchy of directories in which the file is located is located at is called

  path
• example of complete path:

  : C:\Java\Chapter8\example.txt
• symbol of path delimiter

  \
• the special character used to separate path components.

  path delimiter or backslash\
• What is a Path Class?

  creates objects that contain information about files and directories (such as sizes, locations, creation dates)

  used to check whether a file or directory exists.
• creates objects that contain information about files and directories, such as sizes, locations, creation dates

  path class
• used to check whether a file or directory exists.

  path class
• used to check whether a file or directory exists.

  path class
• examples of information about files and directories

  sizes, locations, creation dates
• performs operations on files and directories

  File class
• examples of operation on files and directories

  determining their attributes

  creating input and output streams

  deleting them.
• performs operations on files and directories, such as determining their attributes, creating input and output streams, and deleting them.

  file class
• how to use both file and path class?

  import java.nio.file.*;
• To create and define a Path, use the Paths class and its get() method. Example: 


  Path filePath = Paths.get(“C:\\Java\\Chapter8\\sample.txt”);
• a complete path


  absolute path
• what is absolute path


  a complete path