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401.04 Reading Notes |
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In software, objects are collections of data that include states and behaviors.
- States: Changable attributes of the object. Stored in fields (variables in many languages).
- Behaviors: Functions/methods that perform based on the object's state.
- Data encapsulation: Principle of OOP where an object's state is only expressed/interacted with via behaviors.
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Advantages of OOP include:
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Reusability of code
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Portability of code to other code bases
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Obscurity of internal data (as interactions happen on outer functional bases)
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Can be replaced with other objects as needed
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In programming, a class is a category of objects-- an individual object may be an instance of a given class.
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Classes are not independent applications, but are declared and called.
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Declarations include:
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Modifiers for access
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A capitalized name
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A single parent class (if applicable), with syntax
extends Parent -
Interface(s), with syntax
implements firstInterface, subsequentInterface -
Code block for the body of the class within curly braces
{}
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Binary : "Base-two" numeral system. Conventionally represented with characters "0" and "1". Used in computing as most basic analogue to on/off or unpowered/powered state.
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Decimal : "Base-ten" numeral system. Characters usually used are "0", "1" through "9". Extremely common for most types of measurement in the contemporary world.
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Hexadecimal : "Base-sixteen" numeral system (contemporary characters used are : "0", "1" through "9", and "A" through "F").
- Computing uses are common due to easier conversion from binary than to decimal notation.