Introduction to Computers & Java CSS 161: Fundamentals of Computing Joe McCarthy 1

Outline Introduction to Computers Introduction to Computer Programming Introduction to Java CSS 161: Fundamentals of Computing2

Computers CSS 161: Fundamentals of Computing3

Computer Hardware CSS 161: Fundamentals of Computing4

Computer Hardware CSS 161: Fundamentals of Computing5

Computer Software CSS 161: Fundamentals of Computing6

Computer Software CSS 161: Fundamentals of Computing7

Note: program must be loaded into memory in order to execute 8

Computer Memory CSS 161: Fundamentals of Computing9

Computer Memory CSS 161: Fundamentals of Computing Alternate perspectives: Key attributes: addressable / labeled locations that can store things 10

Computer Disk(s) CSS 161: Fundamentals of Computing11

Computer Disk(s) CSS 161: Fundamentals of Computing Alternate perspectives: 12

Hierarchy of Memory CSS 161: Fundamentals of Computing Variables? [CSS 422 and CSS 430 go into much further depth] 13

Hierarchy of Memory CSS 161: Fundamentals of Computing Variables: Speed Cost Size Volatility [CSS 422 and CSS 430 go into much further depth] 14

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Fundamentals of Computing CSS 161: Fundamentals of Computing16

Fundamentals of Computer Programming CSS 161: Fundamentals of Computing17

Fundamentals of Computer Programming What is a program? CSS 161: Fundamentals of Computing18

Fundamentals of Computer Programming What is a program? What is programming? CSS 161: Fundamentals of Computing19

Fundamentals of Computer Programming What is a program? What is programming? What is a computer program? CSS 161: Fundamentals of Computing20

Fundamentals of Computer Programming What is a program? What is programming? What is a computer program? What is computer programming? CSS 161: Fundamentals of Computing21

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CSS 161: Fundamentals of Computing FirstProgram.java FirstProgram.class javac java 23

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[In Mac OS X Terminal window] CSS 161: Fundamentals of Computing25 d :Code joe$ ls FirstProgram* FirstProgram.java d :Code joe$ javac FirstProgram.java d :Code joe$ ls FirstProgram* FirstProgram.classFirstProgram.java d :Code joe$ java FirstProgram Hello reader. Welcome to Java. Let's demonstrate a simple calculation. 2 plus 2 is 4 d :Code joe$

[In Mac OS X Terminal window] CSS 161: Fundamentals of Computing26 d :Code joe$ ls FirstProgram* FirstProgram.java d :Code joe$ javac FirstProgram.java d :Code joe$ ls FirstProgram* FirstProgram.classFirstProgram.java d :Code joe$ java FirstProgram Hello reader. Welcome to Java. Let's demonstrate a simple calculation. 2 plus 2 is 4 d :Code joe$ Program [only] computes = 4. How can we make this more general?

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Java Programs CSS 161: Fundamentals of Computing28

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Java Goal: – Write once, run anywhere – JDK: Java Developers Kit – JRE: Java Runtime Environment Editions – SE: Standard Edition – EE: Enterprise Edition – ME: Micro Edition (mobile, embedded) – Embedded: flash memory, closed systems Versions – 1.0 (1992), (2006), 1.7 (2011) CSS 161: Fundamentals of Computing30

Downloading Java [optional] – Current: Version 7 update 7 (1.7u7) On Mac, requires Mac OS X or higher – Can also use Version 6 update 35 (1.6u35) Supported thru February 2013 We will be writing (developing) Java code, so we want JDK – Which includes JRE CSS 161: Fundamentals of Computing31

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Integrated Development Environments (IDEs) Programming tools – Edit text (code) + compile + run – Graphical representations of components We’ll be using BlueJ, but you can use others CSS 161: Fundamentals of Computing netbeans.orgeclipse.orgbluej.org 33

Downloading BlueJ [optional] CSS 161: Fundamentals of Computing 34

UWB CSS Labs CSS 161: Fundamentals of Computing35

Next time (Wednesday) Get textbook Read: – Absolute Java, Section – Java: An Introduction…, Sections Recommended: Section 1.4 CSS 161: Fundamentals of Computing36