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14 - Hierarchies CS133 Developing Programming Principles...

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1 CS133: Developing Programming Principles Lecture 14 Class hierarchies, super/subclasses, calling superclass constructors, overriding methods 2 CS133 Course Notes Lecture 14, Slide 2 Hierarchies Information may be organized in a non- linear manner. Hierarchies represent dependencies or relationships in a non-linear, tree-like structure. • Examples: – People/Students/Co-op students – Classification of matter
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3 CS133 Course Notes Lecture 14, Slide 3 Example Person Instructor Student Co-op Student Grad Student 4 CS133 Course Notes Lecture 14, Slide 4 Another example Matter Pure substances Mixtures Heterogeneous Homogeneous Compounds Elements
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5 CS133 Course Notes Lecture 14, Slide 5 Observations Notice that the root of the hierarchy is the most general (Person, Matter) As we move down through the tree, we become more specific – The attributes become increasingly well- defined. – Example: Co-op Student is more specific than Student, which is more specific than Person. 6 CS133 Course Notes Lecture 14, Slide 6 Observations continued Attributes are passed down the tree – Example: if person has an address, then students will also have an address. The CS/Java/O-O hierarchies will guarantee the above point – In “real life”, not all attributes are inherited
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7 CS133 Course Notes Lecture 14, Slide 7 How does this relate to CS? We will treat these classes of things as objects , and relate them together using INHERITANCE 8 CS133 Course Notes Lecture 14, Slide 8 Person Suppose we know that all people have a name and an address. We can do the following to the name and address: – Set – Compare – Retrieve
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9 CS133 Course Notes Lecture 14, Slide 9 The Person class public class Person { private String name; private String address; public Person(String newName) { this.name = newName; this.address = ""; } public Person(String newName, String newAddress) { this.name = newName; this.address = newAddress; } 10 CS133 Course Notes
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