java - How to sort descending contents from file and get it only 5 line -

how read file 5 line , line in sort descending. example have file my.log following contents:

one 2 3 4 5 6 7 8 9 ten eleven twelve 

and want result follows:

twelve eleven ten 9 8 

my code :

import android.os.bundle; import android.app.activity; import android.util.log; import java.io.bufferedreader; import java.io.filereader; import java.io.ioexception;  public class mainactivity extends activity {      long sleeptime = 1000;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         string log = "/sdcard/my.log";         try {             tail(log);         } catch (ioexception e) {             e.printstacktrace();         }     }      public void tail(string filename) throws ioexception {         file checkfile = new file(filename);         if (checkfile.exists()) {             bufferedreader input = new bufferedreader(new filereader(filename));             string currentline = null;              while (true) {                 if ((currentline = input.readline()) != null) {                     log.d("mylog", currentline);                     continue;                 }                  try {                     thread.sleep(sleeptime);                 } catch (interruptedexception e) {                     thread.currentthread().interrupt();                     break;                 }              }             input.close();         } else {             log.d("mylog", "file not found...");         }     }  } 

but time result content in file in print , result not sort descending. result below:

one 2 3 4 5 6 7 8 9 ten eleven twelve 

thanks.

read file line line keep last 5 lines, use linkedlist , add last read line atthe beginning. if after each line list has more 5 lines delete 5th one:

bufferedreader reader = new bufferedreader(new filereader(mylog)); string line; while((line = reader.readline()) != null) {     lastlines.add(0, line);     if(lastlines.size() > 5)         lastlines.remove(5); }  // lastlines have 5 lines in reversed order system.out.println(lastlines);