How to sort java collection?

Sort by specific element:

case1: sort by file name

Collection => List<File> fileList = new ArrayList<File>();

(ref: number of IO comparator can be used in apache commons)

import org.apache.commons.io.comparator.NameFileComparator;

Collections.sort(fileList, NameFileComparator.NAME_COMPARATOR);

ref:

http://www.java2s.com/Code/Java/Apache-Common/ComparatorExampleForUserDefinedClass.htm