Here is an example of how to use the CountingPathVisitor class from the org.apache.commons.io package in Java:

import java.io.File;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.filefilter.TrueFileFilter;
import org.apache.commons.io.filefilter.IOFileFilter;
import org.apache.commons.io.filefilter.WildcardFileFilter;
import org.apache.commons.io.comparator.PathFileComparator;
import org.apache.commons.io.comparator.SizeFileComparator;
import org.apache.commons.io.comparator.CountingPathVisitor;

public class CountingPathVisitorExample {
    public static void main(String[] args) {
        // Define the directory to search in
        File directory = new File("/path/to/directory");
        
        // Define the file filter to use
        IOFileFilter fileFilter = new WildcardFileFilter("*.txt");
        
        // Define the path comparator to use
        PathFileComparator pathComparator = new PathFileComparator();
        
        // Define the size comparator to use
        SizeFileComparator sizeComparator = new SizeFileComparator();
        
        // Create a new CountingPathVisitor instance
        CountingPathVisitor visitor = new CountingPathVisitor(fileFilter, pathComparator, sizeComparator);
        
        // Visit all files in the directory
        FileUtils.visitFileTree(directory, visitor);
        
        // Get the count of the files
        long count = visitor.getCount();
        System.out.println("Number of files: " + count);
    }
}

In this example, we are using the CountingPathVisitor class to count all the files in a specific directory that match a certain file filter, in this case, files that end with ".txt".