java - sorting array of type object using Arrays.sort() method

Question

I know how to sort an array of objects using Arrays.sort() method in following way.

Arrays.sort(array of primitive type);   
Arrays.sort(array of primitive type, from, to); 
Arrays.sort(array of an object type);   
Arrays.sort(array of an object type , from, to);    

but i have no idea about following two methods.

Arrays.sort(array of an object type , comparator);  
Arrays.sort(array of an object type , from, to, comparator);    

Can someone please let me know how to sort array of type object using these methods.I request you to add code or any link that directs to the .java class.I tried to search it but could not find it.

Thanks.

Answer 1

Example:

class Person{  
   int id;  
   public getId(){return this.id;}  
//Other  stuff in your custom class
}  

Person[] persons = ...;//An array of person you get from somewhere
Arrays.sort(persons,new Comparator<Person>(){  
    @Override  
    public int compare(Person p1, Person p2){  
         return p1.getId() - p2.getId();  
   }  
} );