Here is an example of how to use the AccumulatorPathVisitor 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.AccumulatorPathVisitor;

public class AccumulatorPathVisitorExample {
    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 AccumulatorPathVisitor instance
        AccumulatorPathVisitor visitor = new AccumulatorPathVisitor(fileFilter, pathComparator, sizeComparator);
        
        // Visit all files in the directory
        FileUtils.visitFileTree(directory, visitor);
        
        // Get the accumulated files
        List<File> files = visitor.getFiles();
        
        // Do something with the accumulated files
        for (File file : files) {
            System.out.println(file.getName());
        }
    }
}

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