exclusive_instance_method.rb

# Exclusive instance method
# In Ruby, you can define instance methods that are exclusive to a specific class.
# This means that the method is only available to instances of that class and not to instances of any other class, even if they are subclasses of the original class.
# This is achieved by defining the method within the class definition, and it will not be inherited by any subclasses.

class Parent
  def say_hello_parent
    "Hello from the parent!"
  end
end

class Child < Parent
  def say_hello_child
    "Hello from the child!"
  end
end

parent1 = Child.new
parent2 = Child.new

puts parent1.say_hello_parent # Output: Hello from the parent.
puts parent2.say_hello_parent # Output: Hello from the parent.

child1 = Child.new
child2 = Child.new

puts child1.say_hello_child # Output: Hello from the child.
puts child2.say_hello_child # Output: Hello from the child.