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  1.  
  2. import java.util.*;
  3. import java.lang.*;
  4. import java.io.*;
  5.  
  6.  
  7.  
  8. class FilesByExtension
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		String [] arrFiles = 
  13. 							{"b.txt", "a.txt", "a.doc", "b.doc", "z.aaa", 
  14. 							 ".htaccess", "a.zzz", "noextension", ".nonombre",
  15. 							 "a1.txt", "a11.txt", "11z.html", "^fake.exe",
  16. 							 "numextension.11txt", "espacioextension. <-un espacio!", "extensionsimbolo@email.@com", 
  17. 							 "split.py"
  18. 							 };
  19. 		String [] arrFilesOk = dirListByExtension(arrFiles);
  20. 		System.out.println(Arrays.toString(arrFilesOk));
  21. 	}
  22.  
  23.   public static String [] dirListByExtension(String [] arrFiles)  {
  24.    Arrays.sort(arrFiles, new Comparator<String>() {
  25.     @Override
  26.  
  27.       public int compare(String ss1, String ss2) {
  28.           String s1 = ss1.toLowerCase();
  29.           String s2 = ss2.toLowerCase();
  30.           final int s1Dot = s1.lastIndexOf('.');
  31.           final int s2Dot = s2.lastIndexOf('.');
  32.           // 
  33.           if ((s1Dot == -1) == (s2Dot == -1)) { // both or neither
  34.               s1 = s1.substring(s1Dot + 1);
  35.               s2 = s2.substring(s2Dot + 1);
  36.               return s1.compareTo(s2);
  37.           } else if (s1Dot == -1) { // only s2 has an extension, so s1 goes first
  38.               return -1;
  39.           } else { // only s1 has an extension, so s1 goes second
  40.               return 1;
  41.           }
  42.       }
  43.     });
  44.    return arrFiles;  
  45.   /*	
  46.   	Arrays.sort(arrFiles, new Comparator<String>() {
  47.  
  48.     @Override
  49.     public int compare(String s1, String s2) {
  50.         final int s1Dot = s1.lastIndexOf('.');
  51.         final int s2Dot = s2.lastIndexOf('.');
  52.         if ((s1Dot == -1) == (s2Dot == -1)) { 
  53.             s1 = s1.substring(s1Dot + 1);
  54.             s2 = s2.substring(s2Dot + 1);
  55.             return s1.compareTo(s2);
  56.         } else if (s1Dot == -1) { 
  57.             return -1;
  58.         } else { 
  59.             return 1;
  60.         }
  61.     }
  62. });
  63.    return arrFiles;
  64.  
  65.  
  66. */
  67.  
  68.   }  
  69. }
Success #stdin #stdout 0.04s 4386816KB
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Standard input is empty
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[noextension, espacioextension. <-un espacio!, numextension.11txt, extensionsimbolo@email.@com, z.aaa, a.doc, b.doc, ^fake.exe, .htaccess, 11z.html, .nonombre, split.py, b.txt, a.txt, a1.txt, a11.txt, a.zzz]
https://ideone.com/3Fj1hd
FilesbyExtensionSort
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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