When can a situation arise where the interface of an object is equal to null?

In Go, an interface can be nil in two cases:

1. When a variable of interface type does not contain any value (i.e., it does not point to any object).
2. When the interface contains a pointer to a struct, which itself is nil.

It is important to understand that an interface consists of two parts: the type and the value. An interface is nil only if both — the type and the value — are nil. If the type is set, but the value is nil, the interface is not nil.

Example:

var i interface{} // i == nil

var p *int = nil
var i2 interface{} = p // i2 != nil, although p == nil

fmt.Println(i == nil)  // true
fmt.Println(i2 == nil) // false

Such situations often occur when working with interfaces and pointers, and it is important to consider this when checking for nil.