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From the List help: List.Initialize2 Method Initializes a list with the given values. This method should be used to convert arrays to lists. Note that if you pass a list to this method then both objects will share the same list, and if you pass an array the list will be of a fixed size. Meaning that
link: Hello Guys, I have the following code to shuffle LIST1 into LIST2, but at the end both lists are shuffled. I want LIST1 as it was originally. What a

Tip - List.Initialize2 is never really needed. It is the same as: Dim sheetslist As List = sheets

Check List.Initialize2 documentation: https://www.b4x.com/b4j/help/collections.html#list_initialize2
link: I suspect because List3List is using initialize2 + An Array ' this works List4.Initialize List4.Add("test-2") List4.Add("test-1") List4
link: Pfft. :oops: RTFM Alain, RTFM...
link: https://www.b4x.com/android/forum/threads/b4j-list-removeat-fails-on-list-where-initialize2-used.44027/ :) I'm getting posts late, it seems.

See the documentation of List.Initialize2.
link: My bad :( corect code in UserMarkAsConnected: Else Dim wsList As List wsList.Initialize wsList.Add(ws) ActiveUsers.Put(UserID, wsList) EndIf

Initialize2 (Array As String ("9C3W9QCJ+2VX", "9QCJ+2VX")) shortCodes(7).Initialize2 (Array As String ("9C3W9QCJ+2VX", "9QCJ+2VX")) shortCodes(8).Initialize2 (Array As String ("9C3W9QCJ+2VX", "9QCJ+2VX")) shortCodes(9).Initialize2 (Array As String ("8FJFW222+", "22+")) shortCodes(10)

That's not a bug. In the comments for the Initialize2 method, this is explained. If you pass an Array to this method, then the resulting List will be of fixed size and you can't add or remove items.
link: If you initialize a List using Initialize2 and then you call its method Clear, you get: java.lang.UnsupportedOperationException

Because Initialize2 creates a fixed size list. The same as if you do: Dim l As List = Array("Test","Test") l.Add("Test") You need to do: Dim NewList As List NewList.Initialize NewList.AddAll(PreviousList) NewList.Add(NewValue)
link: Tip: never use List.Initialize2. As @stevel05 wrote you can convert an array to a read-only list directly.

In one wee word @Albert Kallal , yes...
link: Thank you for that wee bit of advice! I just did not want to start out writing too much code down a bad garden path. A simple question, but I do fee
link: I have this wee bit of code: Dim f As String = "City,FirstName,LastName" ' field list Dim v As List

There is actually never any good reason to use List.Initialize2. It is equivalent to: Dim l As List = numbers

JsonGenerator.Initialize2 accepts a List.

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