Question

I’m creating a new object ‘baby’ from within class ‘mother’ which implements an interface containing one method ‘feed’ (the names are just for illustration).

How can I pass a pointer to the ‘mother’ class through the constructor of the ‘baby’ class?
I want the baby class to be able to call the ‘feed’ method at any time throughout its lifetime.

What I had tried so far always produced compiler errors.

Constructor of baby class

public Baby(String name, Mother mother) {
    this.mother=mother;
    this.name=name;
}

Code used to create the baby object (inside Mother class)

Baby baby = new Baby("Brian",this);

Answer 1

I’m trying to create the baby object from inside a static main method in the Mother class.

You can’t pass this inside static context, e.g. as a static field, in a static {} initializer or in a static method() method. The static context applies to the class itself, not to a particular instance.

Do the job in the constructor or non-static field/method of Mother instead.