Building the anonymous inner class in-place

    
// : c12:DirList3.java
// Building the anonymous inner class "in-place."
// {Args: "D.*\.java"}
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

import java.io.File;
import java.io.FilenameFilter;
import java.util.Arrays;
import java.util.Comparator;
import java.util.regex.Pattern;

public class DirList3 {
  public static void main(final String[] args) {
    File path = new File(".");
    String[] list;
    if (args.length == 0)
      list = path.list();
    else
      list = path.list(new FilenameFilter() {
        private Pattern pattern = Pattern.compile(args[0]);

        public boolean accept(File dir, String name) {
          return pattern.matcher(new File(name).getName()).matches();
        }
      });
    Arrays.sort(list, new AlphabeticComparator());
    for (int i = 0; i < list.length; i++)
      System.out.println(list[i]);
  }
} ///:~

class AlphabeticComparator implements Comparator {
  public int compare(Object o1, Object o2) {
    String s1 = (String) o1;
    String s2 = (String) o2;
    return s1.toLowerCase().compareTo(s2.toLowerCase());
  }
} ///:~

Related examples in the same category

1.	Creating a Comparable object
2.	Writing Your own Comparator
3.	A Class Implementing Comparable
4.	Comparator for comparing strings ignoring first character
5.	List and Comparators
6.	Sort backwards
7.	Company and Employee
8.	Search with a Comparator
9.	Keep upper and lowercase letters together
10.	Uses anonymous inner classes
11.	Sort an array of strings in reverse order.
12.	Sort an array of strings, ignore case difference.
13.	Comparator uses a Collator to determine the proper, case-insensitive lexicographical ordering of two strings.
14.	Using the Comparable interface to compare and sort objects
15.	Sort on many(more than one) fields
16.	File Name Comparator
17.	Comparator similar to String.CASE_INSENSITIVE_ORDER, but handles only ASCII characters
18.	Natural Order Comparator
19.	Reverse Order Comparator
20.	A Comparator for Boolean objects that can sort either true or false first
21.	Invertible Comparator
22.	This program animates a sort algorithm

Building the anonymous inner class in-place : Comparator « Collections Data Structure « Java

Related examples in the same category