Introduction to Computers & Java

CSS 161: Fundamentals of Computing

Joe McCarthy

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Outline

• Introduction to Computers• Introduction to Computer Programming• Introduction to Java

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Computers

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Computer Hardware

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Computer Hardware

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Computer Software

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Computer Software

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CSS 161: Fundamentals of Computing

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

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Computer Memory

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Computer Memory

CSS 161: Fundamentals of Computing

Alternate perspectives:

Key attributes: addressable / labeled locations that can store things

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Computer Disk(s)

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Computer Disk(s)

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Alternate perspectives:

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Hierarchy of Memory

CSS 161: Fundamentals of Computing

Variables?

[CSS 422 and CSS 430 go into much further depth]

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Hierarchy of Memory

CSS 161: Fundamentals of Computing

Variables:• Speed• Cost• Size• Volatility

[CSS 422 and CSS 430 go into much further depth]

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Fundamentals of Computing

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Fundamentals of Computer Programming

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Fundamentals of Computer Programming

• What is a program?

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Fundamentals of Computer Programming

• What is a program?• What is programming?

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Fundamentals of Computer Programming

• What is a program?• What is programming?• What is a computer program?

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Fundamentals of Computer Programming

• What is a program?• What is programming?• What is a computer program?• What is computer programming?

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CSS 161: Fundamentals of Computing

FirstProgram.java

FirstProgram.class

javac

java

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[In Mac OS X Terminal window]

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d-173-250-140-5:Code joe$ ls FirstProgram*FirstProgram.javad-173-250-140-5:Code joe$ javac FirstProgram.javad-173-250-140-5:Code joe$ ls FirstProgram*FirstProgram.class FirstProgram.javad-173-250-140-5:Code joe$ java FirstProgramHello reader.Welcome to Java.Let's demonstrate a simple calculation.2 plus 2 is 4d-173-250-140-5:Code joe$

[In Mac OS X Terminal window]

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d-173-250-140-5:Code joe$ ls FirstProgram*FirstProgram.javad-173-250-140-5:Code joe$ javac FirstProgram.javad-173-250-140-5:Code joe$ ls FirstProgram*FirstProgram.class FirstProgram.javad-173-250-140-5:Code joe$ java FirstProgramHello reader.Welcome to Java.Let's demonstrate a simple calculation.2 plus 2 is 4d-173-250-140-5:Code joe$

Program [only] computes 2 + 2 = 4.How can we make this more general?

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Java Programs

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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), .. 1.6 (2006), 1.7 (2011)

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Downloading Java [optional]

• http://www.java.com/getjava/– Current: Version 7 update 7 (1.7u7)• On Mac, requires Mac OS X 10.7.3 or higher

– Can also use Version 6 update 35 (1.6u35)• http://www.java.com/en/download/manual_v6.jsp• Supported thru February 2013

• We will be writing (developing) Java code, so we want JDK– Which includes JRE

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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

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Downloading BlueJ [optional]

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http://www.bluej.org/download/download.html

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UWB CSS Labs

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http://www.uwb.edu/css/facilities

Next time (Wednesday)

• Get textbook• Read: – Absolute Java, Section 1.1-1.2– Java: An Introduction…, Sections 1.1-1.3• Recommended: Section 1.4

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