Android Question Initialize, Initialize2 and IsInitialized

Alessandro71

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How does B4X tags an object as "initialized"?
I understand that calling "Initialize" does the trick, but I saw some classes also have an "Initialize2" sub that seems to do the trick also.
If my class has 3 different initialize use cases, may I create an Initialize3 and have the IsInitialized return True?
 
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Daestrum

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As I understand it ( small example)

main code
B4X: 
    Dim c1 As MyClass1
    Log(c1)
    c1.Initialize
    Log(c1)
    c1.Initialize2("fred")
    Log(c1)
    c1.Initialize3("Mike",44)
    Log(c1)

MyClass
B4X: 
Sub Class_Globals
    Dim isInitialized As Boolean = False
    Dim name As String
    Dim age As Int
End Sub

'Initializes the object. You can add parameters to this method if needed.
Public Sub Initialize ' do nothing just default values
    isInitialized = True
End Sub

public Sub Initialize2(n As String) ' set name ignore age
    name = n
    isInitialized = True
End Sub

public Sub Initialize3(n As String, a As Int) ' set name and age
    name = n
    age = a
    isInitialized = True
End Sub
 
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Star-Dust

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If you create the class in Java you can use Initialize, Initialize2 etc... If you create it from the IDE environment only Initialize is valid
 
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Alessandro71

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LucaMs said:
The "original" Sub Initialize must be called anyway.

You could add a parameter to it; a map would be a good choice.

Sub Initialize(Params As Map)
Click to expand...
I understand the concept of using a Map to accomodate a variable count of arguments, but I still prefer the multiple Subs approach, since it can enforce, at least, some type checking on the arguments
 
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Daestrum

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slightly different way - you just call initialize ( this is easier to read)
B4X: 
Sub Process_Globals
    Type JustName(n As String)
    Type NameAndAge(n As String, a As Int)
End Sub

Sub AppStart (Args() As String)
    Dim c1,c2,c3 As MyClass1
    Log("C1 initialized = " & c1.isInitialized)

    c1.Initialize(Null)
    Log("C1 initialized = " & c1.isInitialized)
    
    c2.Initialize(CreatejustName("fred"))
    Log("C2 initialized = " & c2.isInitialized)
    
    c3.Initialize(CreatenameAndAge("Mike",44))
    Log("C3 initialized = " & c3.isInitialized)
End Sub


Public Sub CreatejustName (n As String) As JustName
    Dim t1 As JustName
    t1.Initialize
    t1.n = n
    Return t1
End Sub

Public Sub CreatenameAndAge (n As String, a As Int) As NameAndAge
    Dim t1 As NameAndAge
    t1.Initialize
    t1.n = n
    t1.a = a
    Return t1
End Sub

MyClass
B4X: 
Sub Class_Globals
    Dim isInitialized As Boolean = False
    Private name As String 'ignore
    Private age As Int 'ignore
End Sub

'
Public Sub Initialize(o As Object)
    isInitialized = True
    If o = Null Then Return ' no params just initialize
    
    If o Is justName Then   ' initialize with name only
        Initialize2(o.As(justName).n)
    else if o Is nameAndAge Then  ' initialize name and age
        Initialize3(o.As(nameAndAge).n,o.As(nameAndAge).a)
    End If
End Sub

Public Sub Initialize2(n As String) ' set name ignore age
    name = n
    isInitialized = True
End Sub

Public Sub Initialize3(n As String, a As Int) ' set name and age
    name = n
    age = a
    isInitialized = True
End Sub
 
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