20582195
Description
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
- 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
- or primitive
- Mthod name
- list of arguements
- Return value
- Body
- code that perform
the action
- code that perform
the action
- Main: a special method
- Application : many class and only one
need main method to be invoked
- Application : many class and only one
need main method to be invoked
- UML diagram: summary of all fields type and
methods signature
- Declaration part (the
signature of the method)
- 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
- 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
- stack :pimitives
- ＞=1 Constructor
- Abstraction: the act of
using programming object
to represent a real-world
object
- ＞=1 reference variable
- Null: no value .Test by operator
- Null: no value .Test by operator
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