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

import java.io.File;
import org.apache.commons.io.filefilter.CanReadFileFilter;

public class Example {
    public static void main(String[] args) {
        // create a File object for the directory to be listed
        File directory = new File("/path/to/directory");

        // create a CanReadFileFilter object
        CanReadFileFilter fileFilter = CanReadFileFilter.CAN_READ;

        // list all files that are readable
        File[] readableFiles = directory.listFiles(fileFilter);
        for (File file : readableFiles) {
            System.out.println(file.getName());
        }
    }
}

This example will filter all files that are readable from a directory and print the names of all the readable files.

You can also use the CanReadFileFilter,CanWriteFileFilter,CanExecuteFileFilter,CanReadFileFilter ,IsDirectoryFileFilter,IsFileFileFilter,NotFileFilter,SizeFileFilter,TrueFileFilter,FalseFileFilter, WildcardFileFilter and many more classes of FileFilterUtils to filter files.