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

import java.io.File;
import org.apache.commons.io.comparator.CompositeFileComparator;
import org.apache.commons.io.comparator.LastModifiedFileComparator;
import org.apache.commons.io.comparator.SizeFileComparator;

public class Example {
    public static void main(String[] args) {
        File[] files = ...
        CompositeFileComparator comparator = new CompositeFileComparator(
            LastModifiedFileComparator.LASTMODIFIED_COMPARATOR,
            SizeFileComparator.SIZE_COMPARATOR
        );
        Arrays.sort(files, comparator);
    }
}

In this example, we create an instance of the CompositeFileComparator class and pass two comparators to it: LastModifiedFileComparator.LASTMODIFIED_COMPARATOR and SizeFileComparator.SIZE_COMPARATOR. These comparators compare files based on their last modified timestamps and size respectively.

The CompositeFileComparator class allows you to chain multiple comparators together, so that when you sort an array of files using this comparator, the files will be sorted first by their last modified timestamps, and in case of tie the size will be used to sort. The Arrays.sort() method is used to sort the files array using the comparator instance.

Keep in mind that the order in which the comparators are passed to the CompositeFileComparator constructor is important, as it determines the priority of the sorting criteria.