Because of inheritance classes lower down in hierarchy get the features of those higher up.
At the same time it can add specific features of their own.
Ruby doesn't support multiple inheritance.
class ParentClass def method1 # www .ja va 2s .com puts "Hello from method1 in the parent class" end def method2 puts "Hello from method2 in the parent class" end end class ChildClass < ParentClass def method2 puts "Hello from method2 in the child class" end end my_object = ChildClass.new my_object.method1 my_object.method2
First you create the ParentClass with two methods, method1 and method2.
Then you create ChildClass and make it inherit from ParentClass using the ChildClass < ParentClass notation.
Last, you create an object instance of ChildClass and call its method1 and method2 methods.