import java.io.File;
import java.util.ArrayList;
import java.util.List;

class JavaClass {
    void foo(File file, List<String> target) {
        ArrayList<String> list = new ArrayList<String>();
        if (file != null) {
            list.add(file.getName());
        }
        if (target != null) {
            target.addAll(list);
        }
    }
}