Solutions - Design Patterns Java - page 351

Decorator (Chapter 27)
SOLUTION 27.1
One answer is:
Writer out = new PrintWriter(System.out);
out = new WrapFilter(new BufferedWriter(out), 15);
((WrapFilter) out).setCenter(true);
out = new RandomCaseFilter(out);
Alternatively:
WrapFilter out =
new WrapFilter(
new BufferedWriter(
new RandomCaseFilter(
new PrintWriter(System.out))),
15);
out.setCenter(true);
The com.oozinoz.applications package includes classes ShowFilters2 and
ShowFilters3 , which apply these two methods, respectively:
package com.oozinoz.applications;
import java.io.*;
import com.oozinoz.io.*;
public class ShowFilters3
{
public static void main(String args[])
throws IOException
{
BufferedReader in =
new BufferedReader(new FileReader(args[0]));
WrapFilter out =
new WrapFilter(
new BufferedWriter(
new RandomCaseFilter(
new PrintWriter(System.out))),
15);
out.setCenter(true);
while (true)
{
String s = in.readLine();
if (s == null)
{
break;
}
out.write(s + "\n");
}
out.close();
in.close();
}
}