flex study notes (2)
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(1)There are two types of novisual components:data componet and utility components.
Data components are used to create data structure such as arrays and collections. Utility compnents are components used to achieve functionality .
(2)A event is a way that a component can notifty other parts of the application when some action occurs.
(3)Handle event : one way is to use actionscript to register listeners. The other way is we can add inline event handle attributes within a componet tag.
(4)Data binding is a feature you can use to link a component to another component or an ActionScript.
Data binding automates changing the value of one object when the value of another object project changes.
(5)ActionScript is a standards-based ,oject -oriented language.
(6)The majority of classes are organized into structures called package.
(7)A variable is a named element you can use to store data a reference to data.
(8)DataType:String Number int unit Boolean Data Array
(9)Variables are placed within class methods ,Variables declared outside of methods called properties.
(10)public modifier means teh property is accessible outside the class.
priviate modifier makes the property accessible only with the clss
protected modifier makes teh property accessible within the class and its subclass
internal modifier makes the property accessible only within the package.
flex assumes the methods are internal if you omit the modifier.
(11)ActionScript does not allow overloading .That means you cannot have two methods with the same name but different parameter lists.
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