java - Errors using the Comparator interface -

i trying write simple application priority queues. getting following errors --" error: leastpriority not abstract , not override abstract method compare(integer,integer) in comparator" , "error: incompatible types comparator cmp = new leastpriority(); "

can point out problem code.

my code :

class leastpriority implements comparator<integer> {         public int compare(reservation x, reservation y){         if(x.getpriority() > y.getpriority()){             return -1;         }         if(x.getpriority() < y.getpriority()){             return +1;         }         return 0;     } }  public class prioqueue{      public static void main(string args[]){         comparator<reservation> cmp = new leastpriority();         priorityqueue<reservation> queue = new priorityqueue<reservation>(10,cmp);         queue.add(new reservation(1,"andy",10));         queue.add(new reservation(1,"peter",1));         queue.add(new reservation(1,"john",4));          while(true){             reservation r = queue.poll();             if(r==null){                 break;             }             system.out.println(r.getname());         }      } } 

your type parameter comparator<t> , compare(t o1, t o2) method's parameters not match. since in interface same, need give identical types them.

change this:

class leastpriority implements comparator<integer> 

to:

class leastpriority implements comparator<reservation>