java - How to sort the array list? -

hey guys. thanx major regarding obstacles. problem time is, how can sort array list provided in code dont know whati need add in provied code below, simplyfive got 3 arraylist want make them 1 arraylist, can sorted in amont of guesses , tries( if 2 players have same guesses time should determine) . pretty hard explain tried best.............the best thing run figure whats issue is?

here code:

    import java.util.*; import java.util.scanner.*; import java.util.arraylist.*;   public class main {  public static string tostring(int a, double b, string c)     {         string = integer.tostring(a);         string bs = double.tostring(b);                 string scorelist = (as + "\t\t" + bs + "\t\t" + c);          return scorelist;     }  private static void start() {    int tries = 0 ;   int guess = -1;  string name ;  string quit = "quit";  string y = "yes";  string n = "no";  string currentguess;    string = ("y") ;  scanner input = new scanner (system.in);   arraylist<string> scores = new arraylist<string>();     boolean a=false;    {       a=false;      int answer = (int) (math.random() * 1000 + 1) ;     system.out.println( " welcome guessing game " )  ;     system.out.print("please enter number between 1 , 1000 : ");                     currentguess = input.nextline();             long starttime = system.currenttimemillis();                  {                  if (currentguess.equalsignorecase(quit))         {             system.out.println("leaving soon?");             system.exit(0);         }                 try    {             guess = integer.parseint(currentguess);               } catch (numberformatexception nfe)                          {             system.out.println(" dude can read, digits ");                         currentguess = input.nextline();               }          if (guess < 1 || guess > 1000)         {             system.out.println("stupid guess wont count that.");                         currentguess = input.nextline();          }        if (guess < answer )           {             system.out.println("too low "+answer);             currentguess = input.nextline();                         tries++;         }       else if(guess  > answer )         {             system.out.println("too high "+answer);             currentguess = input.nextline();                         tries++;         }       else if (guess == answer)         {                    //stop stop watch             long endtime = system.currenttimemillis();             //calculate game time             long gametime = endtime - starttime;             system.out.println("you rock dude, job!");                          system.out.println("you guessed " + tries + " times in " + (int)(gametime/1000) + " seconds.");                         system.out.println("please enter name.");                    name = input.nextline();                           //create score object              string tostring =tostring(tries, gametime, name);             //add score arraylist             scores.add(tostring);               boolean s = false  ;               while (s==false)               {                        system.out.print("want go again?(y/n).....");                      currentguess = input.nextline();                       if (currentguess.matches("y"))             {                      system.out.println("highscore: \nguess \t  time in milisec\tname");                 //print out high score list                 (int = 0;i < scores.size(); i++)                 {                 system.out.println(scores.get(i));                 } //                                 main.start                      s=true;              }                       //if user doesn't want play again                               if (currentguess.matches("n"))             {                 system.out.println("highscore:\nguess \ttime in milisec\tname");                 //print out high score list                 (int = 0;i < scores.size(); i++)                 {                 system.out.println(scores.get(i));                 }                                 system.out.println("thanx playing.");                 a=true;                                  s=true;                                  system.exit(0);                       }         }           }          } while (guess != answer);    }while(a==false);  }  public static void main(string[] args) { //   arraylist<score> scores = new arraylist<score>();     main.start();     } } 

use collections.sort() , make sure class implements comparable or use this:

collections.sort(list, new comparator<t>() {          public int compare(t o1, t o2) {             return o1.compareto(o2);         }});