Transcript Introduction

Introduction
Chapter 1
1/22/15 & 1/26/15
Imagine! Java: Programming Concepts in Context by Frank M. Carrano, (c) Pearson Education - Prentice Hall, 2010
Announcements
• Hard copy of first assignment is due.
• Most of you already handed it in.
• Next assignment is on the 119 website.
• To work at home:
– Only need to download Java & eclipse
– Need to transfer program file to onyx
• Could use mobaxterm
*If you can't get into Engr 213 and 214, see the
adminstrative assistants in MEC302J, the CS dept.
Imagine! Java: Programming Concepts in Context by Frank M. Carrano, © Pearson Education – Prentice Hall, 2010
Contents
• An Overview of a Computer
 What Can a Computer Do?
 The Components of a Typical Computer
• A Computing System’s Software
 The Programming Language Java
 Graphics
• Writing, Compiling, and Running a Java
Program
 Tools and Resources
 The Steps
Imagine! Java: Programming Concepts in Context by Frank M. Carrano, © Pearson Education – Prentice Hall, 2010
Objectives
After studying this chapter you should be
able to …
• Describe basic operations of a computer
• State purpose of four major components
of a computer
• Distinguish between contents of a byte
and address
• Describe difference between machine
language and high-level language
Imagine! Java: Programming Concepts in Context by Frank M. Carrano, © Pearson Education – Prentice Hall, 2010
Operations a Computer Does
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Get data from outside world
Save data
Retrieve saved data
Do mathematic operations +, -, /, *
Compare values, =, <, >
Manipulate data
Display numbers, words, symbols,
graphics
Imagine! Java: Programming Concepts in Context by Frank M. Carrano, © Pearson Education – Prentice Hall, 2010
Components of a Computer
• Figure 1-1 Components of a typical
computer
Imagine! Java: Programming Concepts in Context by Frank M. Carrano, © Pearson Education – Prentice Hall, 2010
CPU
• Central Processing Unit
7
7
Imagine! Java: Programming Concepts in Context by Frank M. Carrano, © Pearson Education – Prentice Hall, 2010
CPU
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Brain of the Computer
Carries out instructions from programs
Controls other parts of the computer
Does arithmetic operations and compares
values
Imagine! Java: Programming Concepts in Context by Frank M. Carrano, © Pearson Education – Prentice Hall, 2010
Other Components
• Primary memory
– Stores data and programs temporarily
– volatile
– Another name is RAM
• Secondary memory
– Long term storage
– non-volatile
– Hard disks and DVDs
Imagine! Java: Programming Concepts in Context by Frank M. Carrano, © Pearson Education – Prentice Hall, 2010
Other Components
• Input
– Get data from outside world
– Keyboard, mouse, camera
• Output
– Send data to outside world
– Monitor, speaker, printer
Imagine! Java: Programming Concepts in Context by Frank M. Carrano, © Pearson Education – Prentice Hall, 2010
Components of a Computer
• Figure 1-2 Transfer data to, from computer
memory
Imagine! Java: Programming Concepts in Context by Frank M. Carrano, © Pearson Education – Prentice Hall, 2010
Binary Data
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Data in the computer is stored as bits, or
binary data.
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ON/OFF, electrical charge or no charge.
Eight bits make a byte
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Enough to store a character, 'A', '#', '1'
Data in Memory
• Figure 1-3 Bytes in memory
• Address and contents
Imagine! Java: Programming Concepts in Context by Frank M. Carrano, © Pearson Education – Prentice Hall, 2010
Computing System Software
• Languages
 Machine language used in 1940s
 High-level languages developed, 1950s
• Written program called source code
• Translated to machine language
• Done by compiler or interpreter programs
• Other Software
 Operating system (a program)
 Application programs
Imagine! Java: Programming Concepts in Context by Frank M. Carrano, © Pearson Education – Prentice Hall, 2010
Java Programming Language
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Developed by Sun Microsystems, 1995
Object oriented
Platform independent
Can run within Internet browser
Can execute either locally (application)
or remotely (applet)
Imagine! Java: Programming Concepts in Context by Frank M. Carrano, © Pearson Education – Prentice Hall, 2010
Java Programming Language
• Figure 1-4 Steps of Java program to
achieve platform independence
Imagine! Java: Programming Concepts in Context by Frank M. Carrano, © Pearson Education – Prentice Hall, 2010
Graphics
• Both applications and applets can produce
graphics
• Application with graphical components
called GUI (Graphical User Interface)
• Classes support graphics programming
 Abstract Window Toolkit
 Swing
Imagine! Java: Programming Concepts in Context by Frank M. Carrano, © Pearson Education – Prentice Hall, 2010
Tools and Resources
• Java Development Kit (JDK)
• Text editor, e.g. notepad
• Integrated Development (IDE)
 eclipse is an IDE
 Combines editor, compiler, Java Virtual
Machine
 Also has other features, like a debugger.
Imagine! Java: Programming Concepts in Context by Frank M. Carrano, © Pearson Education – Prentice Hall, 2010
Steps
• Figure 1-5 Steps involved in developing a
Java program
Imagine! Java: Programming Concepts in Context by Frank M. Carrano, © Pearson Education – Prentice Hall, 2010
Questions
• What two major components of a
computer?
• What does the CPU do?
• How does Java differ from other high-level
languages?
• What is the difference between a logic error and
a syntax error?
Imagine! Java: Programming Concepts in Context by Frank M. Carrano, © Pearson Education – Prentice Hall, 2010
For Next Week
Take quiz one on Black Board.
See questions 1, 2, 4, 5, 7 on page 13 before
taking the quiz.
There will be questions from Chapter 1 and
over Linux and eclipse.