File I/O - Java - page 546

Opening a Text File for Reading with BufferedReader
You create a stream of the class BufferedReader and connect it to a text file for reading as
follows:
SYNTAX
BufferedReader Stream_Object =
new BufferedReader( new FileReader( File_Name ));
EXAMPLE
BufferedReader inputStream =
new BufferedReader( new FileReader("morestuff2.txt"));
After this statement, you can use the methods readLine and read to read from the file.
When used in this way, the FileReader constructor, and hence the BufferedReader con-
structor invocation, can throw a FileNotFoundException , which is a kind of IOException .
Display 10.8 Some Methods of the Class BufferedReader (part 1 of 2)
BufferedReader and FileReader are in the java.io package.
public BufferedReader(Reader readerObject)
This is the only constructor you are likely to need. There is no constructor that accepts a file name as
an argument. If you want to create a stream using a file name, you use
new BufferedReader( new FileReader( File_Name ))
When used in this way, the FileReader constructor, and thus the BufferedReader constructor
invocation, can throw a FileNotFoundException , which is a kind of IOException .
The File class will be covered in the section entitled “The File Class.” We discuss it here so that
you will have a more complete reference in this display, but you can ignore the following reference to
the class File until after you've read that section.
If you want to create a stream using an object of the class File , you use
new BufferedReader( new FileReader( File_Object ))
When used in this way, the FileReader constructor, and thus the BufferedReader constructor
invocation, can throw a FileNotFoundException , which is a kind of IOException .
public String readLine() throws IOException
Reads a line of input from the input stream and returns that line. If the read goes beyond the end of
the file, null is returned. (Note that an EOFException is not thrown at the end of a file. The end of a
file is signaled by returning null .)