Chapter One Notes
Main Hardware
-CPU - (Central Processing Unit) executes each step
-I/O Devices - (input/output devices) keyboards, monitors, mouse,etc...
-Main Memory(RAM) - Random Access Memory - Temporary Storage, smaller storage, faster access
-Secondary Memory - Hard Drive, floppy disk, CD. Permanent Storage, larger storage, slower access
One address location is 8 bits which is equivalent to 1 byte.*
SOFTWARE
-Applications - games, Microsoft Word, web browser, etc...
-System - Operating System: manages resources, determines when certain applications run
-G.U.I(geographical User Interface) - windows, shells, icons, buttons, scroll bars
INFORMATION STORAGE
-Analog - continuous
-Digital - broken up
Byte = 2^0 (1)
KB = 2^10(2E10)
MB = 2^20(2E20)
GB = 2^30(2E30)
TB = 2^40(2E40)
2 values for every 1 bit
Base 10
000 = 0
001 = 1
010 = 2
011 = 3
100 = 4
101 = 5
110 = 6
111 = 7
Types of Errors
Compile-time: Any error that is identified by the compiler
Ex: Syntax
Run-time: Occurs during program execution.
English: 2.88 MB floppy disk drive
English: 1.2 MB floppy disk drive
Imation USB 3.5" floppy disk driveIt causes the program to terminate abnormally or "crash".
Ex: dividing by zero(4/0)
Logical: Produces the wrong results
Whole Program
Source Codecompilemachine language(target languages)
Source Codeinterpreter
JAVAbytecode
Primitive Data Types
-int (integer)
-double (Decimal/real)
-Char (characters/letters)
-boolean (yes/no & true/flase)
A class represents a concept, and an object represents the embodiment of the class.
Ex: -Radio
Bank Account
A class can be used to create different objects
An object represents something with which we can interact in a program
-Has attributes and behaviors
-Provides a collection of services that we can tell it to perform for us
-The services are defined by methods in a class that defines the object
Inheritance
-one class can be used to derive another
-classes can be organized into in heritance hierarchies
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