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().
Why should we check for the success of failure of file deletion? (Or for file creation, for that matter?) Because weâre interacting with something (the OS) that our program doesnât control and that can take action on itâs own, independently of how our program behaves. We need to make sure that something that the independent behaviour of the OS didnât interfere with our file creation or deletion.
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.
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
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.
![File I/O ,[object Object],[object Object],[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)