Question

Generally I define Comparator as –

Comparator<Obj> comparator= new Comparator<Obj>() {
    public int compare(Obj o1, Obj o2) { 
        //implementation...
    } 
};

And when the Comaprator is a part of class memeber’s it’s slightly does not looks good on the code format . Is there any way to define the Comparator as Comparator<Obj> comparator= new Comparator<Obj>() and implement his compare in another section ?

Answer 1

Just define a class that implements Comparator interface, and implement the compare method in that class, with your comparison logic: –

public class ObjComparator implements Comparator<Obj> {
    public int compare(Obj o1, Obj o2) { 
        //implementation
    }
}

And then, where-ever you want to use your Comparator, use an instance of this class. For example, in Arrays.sort: –

Obj[] yourArray = new Obj[10];
Arrays.sort(yourArray, new ObjComparator());