Java Reference
In-Depth Information
while (true)
{
String s = in.readLine();
if (s == null)
{
break;
}
out.write(s + "\n");
}
out.close();
in.close();
}
}
The
BufferedReader
class provides the ability to read one line at a time from a file. The
ShowFilters
program creates a
FileWriter
object and decorates it with behaviors to
wrap the text at 40 characters and to titlecase the text. Suppose that a file named
demo.txt
contains:
The "SPACESHOT" shell hovers
at 100 meters for 2 to 3
minutes, erupting star bursts every 10 seconds that
generate abundant reading-level light for a
typical stadium.
Running this file through the
ShowFilters
program cleans up the text:
> java -classpath \oozinoz\classes com.oozinoz.applica-
tions.ShowFilters demo.txt demo-out.txt
>type demo-out.txt
The "Spaceshot" Shell Hovers At 100
Meters For 2 To 3 Minutes, Erupting Star
Bursts Every 10 Seconds That Generate
Abundant Reading-level Light For A
Typical Stadium.
CHALLENGE 27.1
If you want to direct output to
System.out
instead of to a file, you can create
a
Writer
object that directs its output to
System.out
:
Writer out = new PrintWriter(System.out);
Write a snippet of code to define a
Writer
object that wraps text at 15 characters,
centers the text, sets the text to random casing, and directs the output to
System.out
.
The code for most of the filter classes is simple. For example:
