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How Java handles arguments of a class type.

=====suppose such a method:
public static void openFile(String fileName, PrintWriter stream) throws FileNotFoundException
{
   stream = new PrintWriter(fileName);
}
=====then we want to use it this way:
PrintWriter toFile = null;
try
{
   openFile("data.txt", t ......

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KeywordFilter.java:
import java.io.InputStream;
import java.util.Enumeration;
import java.util.Properties;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class KeywordFilter
{
private static Pattern pattern = null;
private static KeywordFilter filter = new KeywordF ......
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