Template:Merge

2007-08-31T06:01:19Z

87.162.104.175:

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Archive:Java File IO

2006-11-30T00:09:11Z

87.162.15.167: /* Files */

File Input/Output is similar to the System.out and System.in that you already have begun using. The only difference is that you read from a file.
=Files=
Files are another type of variable. You can make a file like this:
<pre>File f = new File("test.txt")</pre>
This does not return an exception if the file doesn't exist. To check if it does:
<pre>f.exists()</pre>
This will return a boolean.

To check if it is a file or directory:
<pre>f.isFile()
f.isDirectory()
</pre>
For a full list of methods you can use, go to http://java.sun.com/j2se/1.4.2/docs/api/java/io/File.html

=File Output=
To write to a file, you can use a FileWriter or a FileOutputStream.
==FileWriter==
This class writes strings or char[] to a file. To create one:
<pre>
FileWriter fw = new FileWriter("test.txt");//Create a filewriter writing to test.txt
FileWriter fw = new FileWriter("test.txt", true);//Do not delete contents of file - append
</pre>
It is as simple to write. After you create a FileWriter just use:
<pre>
String s = "Testing"
//INITIALIZE FileWriter fw
fw.write(s);
</pre>
FileWriter can also write in other formats. Using char[]:
<pre>
Char[] charAr=s.toCharArray();//A method in class String
fw.write(charAr);
</pre>
Of course, you should only use this when you already have a character array.

==FileOutputStream==
=File Input=

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Archive:Java File IO