Comp 14 Introduction to Programming

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Comp 14Introduction to Programming
Instructor Prasun Dewan
(Pr?sün Divän)
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Computer World
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Theater Analogy

• Play
• Concert
• Talk
• Speech
• Cooking Lessons
• Town Hall Meeting

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1.1(a) The Theater World
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1.1(b) The Theater World
reads entire script
hears sentence
speaks sentence
writes entire script
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1.1 (a) The Theater World
Original Script
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1.2(a) The Computer World
Object Code
Machine Language
written in
stored in
managing
follows
Processor
Memory
fetched from
interacts with
assists
Debugging
Runtime
Real
Disk / Tape
User
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1.2 (b) The Computer World
Source Code
Programming Language
written in
reads entire code
reads statement
Compiler
Interpreter
writes statement
writes entire code
Object Code
Machine Language
written in
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1.3 Translating using both a Compiler and
Interpreter
Source Code
Compiler
Platform-Independent Intermediate Code
Interpreter
Platform-Specific Machine Code
CPU
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1.2 (a) The Computer World
Program Editor
J
Editor, Programmer, Translator, Operating System
Runtime, Processor
checked by
uses
Libraries
Syntax, Semantics, Logic, Style
Programmer
links
Linker
written by
problems
Programming Language
written in
Source Code
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Computer Vs Theater
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Computer Vs Theater
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Computer Vs Theater

• CPU is fast can do several performances at one
  time.
• CPU is dumb no improvisation possible.
• Machine language much lower-level than
  programming language.

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Why Java

• Modern, modular (object-oriented) language.
• Good Error Detection.
• Rich Library Embodying Many Good Programming
  Principles
• Can Write Teaching Tool (ObjectEditor)

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Java Versions, Dialects Programming Enviromnet

• JDK 1.1
• Microsoft Implementation
• Swing 1.1
• Visual J Programming Environment
• Will not matter