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Object(instance): basic unit of object-oriented programming and represent real life entities.
Description
the basic unit of object_orinented programming
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basic unit of object-oriented programming
Mind Map by
Zixuan Qiu
, updated more than 1 year ago
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Created by
Zixuan Qiu
over 4 years ago
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Resource summary
Object(instance): basic unit of object-oriented programming and represent real life entities.
Field(optional): primitives or references to object.
Also can refer to another object
Method(optional): a class objects can do
Declaration part (the signature of the method)
Return value
or primitive
or object
or void: null
Mthod name
list of arguements
Body
code that perform the action
Main: a special method
Application : many class and only one need main method to be invoked
UML diagram: summary of all fields type and methods signature
Class: a blueprint or a template to create objects of identical type.Determine the object(name methods field)
>=1 Constructor
Like a method, but no return value, the same name with the class. the argument to initialize the field
allocate memory space for data that will be assigned to the vairable.
stack :pimitives
heap: JAVA object
Abstraction: the act of using programming object to represent a real-world object
>=1 reference variable
Null: no value .Test by operator
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