5290289
Description
Mind Map by Nik Nguyen, updated more than 1 year ago
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Created by Nik Nguyen
almost 8 years ago
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Inheritance
- Defined as a relationship between objects that share characteristics
- I.e. -- a new class, aka subclass, is created from an existing class (superclass) by absorbing its state and behavior.
- The subclass INHERITS characteristics of its superclass.
- The subclass INHERITS characteristics of its superclass.
- In code, the relationship is
specified in the declaration of
the subclass, using the keyword
"extends".
- I.e. -- a new class, aka subclass, is created from an existing class (superclass) by absorbing its state and behavior.
- Works by hierarchy
- See the following chart:
- Person
- Student
- GradStudent
- UnderGrad
- GradStudent
- Employee
- Student
- The relationship between classes is called an "is-a" relationship.
- Person
- Subclasses can only inherit from a superclass.
Subclass cannot inherit from another subclass, and
a superclass cannot inherit from a subclass.
- A subclass may inherit the public/protected variables
and methods of its superclass, as well as have
additional methods and instance variables not in the
superclass as well.
- Subclasses can redefine the method it inherits as well.
- I.E. Gradstudent and undergrad may use
different algorithms for computing the course
grade by changing the computeGrade method
inherited from Student.
- I.E. Gradstudent and undergrad may use
different algorithms for computing the course
grade by changing the computeGrade method
inherited from Student.
- Subclasses can redefine the method it inherits as well.
- A subclass may inherit the public/protected variables
and methods of its superclass, as well as have
additional methods and instance variables not in the
superclass as well.
- See the following chart:
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