java - Comparators sorting -

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i'm not comparators need learn it, i've done far keep getting error @ 'system.out.println(compy("january", "march", "october", "april"));'... please help, explanation fix. thank you!

import java.util.collections; import java.util.comparator; import java.util.list;  public class months {     public static void main (string args[]){          system.out.println(comp("january","may"));         system.out.println(comp("october", "may"));         system.out.println(comp("august","august"));         system.out.println(comp("january", "march"));          system.out.println(compy("january", "march", "october", "april"));     }      static int comp(string s1, string s2){          while (true){             int r = 0;             int s = 0;              if(s1.equals("january")){                 r=1;             }              if(s1.equals("february")){                 r=2;             }              if(s1.equals("march")){                 r=3;             }              if(s1.equals("april")){                 r=4;             }              if(s1.equals("may")){                 r=5;             }              if(s1.equals("june")){                 r=6;             }              if(s1.equals("july")){                 r=7;             }               if(s1.equals("august")){                 r=8;             }              if(s1.equals("september")){                 r=9;             }              if(s1.equals("october")){                 r=10;             }              if(s1.equals("november")){                 r=11;             }              if(s1.equals("december")){                 r=12;             }              if(s2.equals("january")){                 s=1;             }              if(s2.equals("february")){                 s=2;             }              if(s2.equals("march")){                 s=3;             }              if(s2.equals("april")){                 s=4;             }              if(s2.equals("may")){                 s=5;             }              if(s2.equals("june")){                 s=6;             }              if(s2.equals("july")){                 s=7;             }              if(s2.equals("august")){                 s=8;             }              if(s2.equals("september")){                 s=9;             }              if(s2.equals("october")){                 s=10;             }              if(s2.equals("november")){                 s=11;             }              if(s2.equals("december")){                 s=12;             }              if(r<s){                 return -1;             }              if(r>s){                 return 1;             }             if(r==s){                 return 0;             }          }         }      public class comp implements comparator {         public int compare(object o1, object o2){             return comp((string)o1, (string)o2);         }     }      void sort(list l){         comparator compy = new comp();         collections.sort(l, compy);     }  }

this how can sort list code.

list<string> list = new arraylist<string>();  list.add("march"); list.add("january"); list.add("october"); list.add("april");  system.out.println("before sort: " + list); // prints: before sort: [march, january, october, april]  new months().sort(list); // sort  system.out.println("after sort: " + list); // prints: after sort: [january, march, april, october]

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