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Jagdish Gangolly |
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State University of New York at Albany |
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Basic Concepts and Strategies |
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Why model? |
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Building blocks of UML |
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Abstraction |
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Formality |
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Divide & Conquer |
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Hierarchical ordering |
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Cohesion & Coupling |
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Information hiding |
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Conceptual integrity |
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Completeness |
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Logical independence |
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Correctness & efficiency |
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To visualize a system as is or as we want it to
be |
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To specify the structure and behavior of the
system |
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To provide a template to guide the construction
of the system |
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To document the decisions made |
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Things |
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Relationships |
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Model of Systems Architecture |
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Hello World! |
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Class: a set of objects [rectangle] |
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Interface: collection of operations specifying s
service [circle] |
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Collaboration: elements working together to
provide cooperative behavior [broken ellipse]] |
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Use Case: a snapshot of one aspect of the system
(realized by a collaboration) [ellipse] |
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Active Class: a class that owns one or more
processes or threads [heavy rectangle] |
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Component: physical and replaceable part of a
system (realises a set of interfaces) [tabbed rectangle] |
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Node: a physical element that exists at runtime
and represents a computational resource [cube] |
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Behavioral things |
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Interaction: set of messages exchanged |
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State machine: model of behavior of a class or
collaboration. Includes states, transitions, events, activities. [rounded
rectangle] |
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Grouping things |
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Packages: [tabbed folder] |
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Annotational things: explanatory notes
[dog-eared rectangle] |
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Dependency [broken arrow] |
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Association [solid line] |
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Aggregation [solid line with a hollow diamond at
the Aggregation end] |
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Composition [solid line with a black diamond at
the aggregation end] |
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Generalisation [solid line with a hollow
arrowhead pointing to the parent] |
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Realisation [broken line with a hollow
arrowhead] |
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The Program: |
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Import jawa.awt.Graphics; |
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Class HelloWorld extends java.applet.Applet{ |
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public void paint (Graphics g) { |
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g.drawString(Hello, World!”, 10,10); |
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} |
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} |
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Notes