package TreeJuxtaposer;import java.io.File;import javax.swing.filechooser.*;public class NewickFilter extends FileFilter {        public boolean accept(File f) {        if (f.isDirectory()) {            return true;        }        String extension = Utils.getExtension(f);		if (extension != null && (extension.equals(Utils.newick)))			return true;	          return false;    }        // The description of this filter    public String getDescription() {	return Utils.newick_file_description;    }}