CSE 3302CSE@UTA

1
CSE3302Programming Languages(new notes)

• Dr. Carter Tiernan

2
Object-Oriented Programming

• Rich interactive environment
• Graphics
• Sound
• Simulation tasks

3
Smalltalk

• Alan Kay
• Xerox PARC - Dynabook
• Windows-oriented display
• Interactive language
• Point and click or dialogue
• Objects and classes

4
Structural Organization

• Objects have a behavior
• Objects can be made to do things by sending them
  messages
• Repetitive operations can be simplified by using
  control structures

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Objects and Classes

• Objects are instantiated
• Classes are defined
• Operators are overloaded implicitly
• Methods work with any object matching protocol
• Hierarchical classes
• Only single inheritance
• Names are not typed - dynamic type checking

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Messages

• Message passing is like procedure invocation
• Three message forms
• Parameters with keywords and colons
• No parameters
• Arithmetic
• Supports concurrency

7
Smalltalk

• Small and regular language
• Windows!
• Integrated programming environment
• Simulation
• Objects to model real-world elements
• Classification of objects
• Interaction through messages