hashCode implementation for singleton class

Question

what will be the implementation for

public int hashCode()
{
}

method in singleton class? Please do provide me the implementation

Answer 1

Since there's only one object, you don't have to worry about making other, equal, objects have the same hashCode. So you can just use System.identityHashCode (i.e. the default).

Answer 2

If it's a singleton, you don't need to provide an implementation, as it will be the same object instance wherever it's used. The default (System.identityHashCode(obj)) will be sufficient, or even just a constant number (eg 5)