Sort directory/file in order of lastModified time

Last exercise describe how to Sort directory/file in alphabetical order ignore case. To Sort directory/file in order of lastModified time, replace filecomparator() method of last exercise with following code:

    Comparator<? super File> filecomparatorByLastModified = new Comparator<File>(){
  
  public int compare(File file1, File file2) {

   if(file1.isDirectory()){
    if (file2.isDirectory()){
     return Long.valueOf(file1.lastModified()).compareTo(file2.lastModified());
    }else{
     return -1;
    }
   }else {
    if (file2.isDirectory()){
     return 1;
    }else{
     return Long.valueOf(file1.lastModified()).compareTo(file2.lastModified());
    }
   }
    
  }  
 };

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