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Java File I/O

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C
Canterbury HS

The document discusses file input/output (I/O) in Java, including how to declare a File object, create and delete files, read from and write to files using FileReader, BufferedReader, FileWriter, and BufferedWriter. Key aspects covered include declaring a File object to represent a file, using try-catch blocks to handle exceptions during file operations, reading lines of text from a file using BufferedReader.readLine(), and writing strings to a file using BufferedWriter.write() and BufferedWriter.newLine().

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File Input/Output (I/O)‏
File I/O ,[object Object],[object Object],[object Object]
File myFile = new File("billy.txt"); ,[object Object],[object Object],[object Object],[object Object]
Create a New File ,[object Object],[object Object]
When file creation goes horribly, horribly wrong ,[object Object],[object Object],[object Object],[object Object]
Exception Handlers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
try…catch block ,[object Object],[object Object]
You Try ,[object Object],[object Object],[object Object],[object Object]
throws – the keyword ,[object Object],[object Object],[object Object],[object Object],[object Object]
Using throw ,[object Object],[object Object],[object Object],[object Object],[object Object]
Deleting Files ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Reading from a file ,[object Object],[object Object]
Reading From A File: Creating a stream ,[object Object],[object Object],[object Object]
Reading From A File: Creating a stream ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Reading From A File: BufferedReader ,[object Object],[object Object],[object Object]
Reading From a File: BufferedReader ,[object Object],[object Object],[object Object]
Reading from a File ,[object Object],[object Object],[object Object]
Using BufferedReader ,[object Object],[object Object],[object Object],[object Object]
Using BufferedReader ,[object Object],[object Object],[object Object]
Reading until the End of the File (EOF) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
You try ,[object Object]
Parsing/Splitting the Input String into words ,[object Object],[object Object]
Parsing/Splitting the Input String into words ,[object Object],[object Object],[object Object],[object Object],[object Object]
Print one word per line ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
http://java.sun.com/docs/books/tutorial/essential/io/streams.html
Writing Program Output to a File ,[object Object],[object Object],[object Object],[object Object]
Writing to a File ,[object Object],[object Object],[object Object]
Writing to a File - BufferedWriter ,[object Object],[object Object]
Writing to a file - write() ,[object Object],[object Object],[object Object]
Writing to a file - write() ,[object Object],[object Object],[object Object],[object Object],[object Object]
Writing to a file - newLine () ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Writing to a file - close() ,[object Object],[object Object]

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Java File I/O

Hinweis der Redaktion

  1. billy
  2. Why should we check for the success of failure of file deletion? (Or for file creation, for that matter?) Because we’re interacting with something (the OS) that our program doesn’t control and that can take action on it’s own, independently of how our program behaves. We need to make sure that something that the independent behaviour of the OS didn’t interfere with our file creation or deletion.
  3. In this diagram, a file we would like to read is represented by the data source. We use a stream to connect it to our program.
  4. We have two choices about how to handle this exception. 1.) We can add the FileNotFoundException to the throws clause. (Use commas to separate multiple clauses 2.) We can add a separate catch block
  5. Overwrite means that it will create a new empty file of the same name. In other words the contents of the original file will be lost.