List (Arraylist function)

From m204wiki
Jump to navigation Jump to search
The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.

Construct and populate a new Arraylist (Arraylist class)

The List shared function is a virtual constructor, or factory method, for Arraylistd. List invokes the creation of a new Arraylist instance, then populates that instance with items that are, respectively, the values of the method arguments.

Syntax

%newList = [%(Arraylist Of itemType):]List( itemList)

Syntax terms

%newlist A declared or existing Arraylist object.
[%(Arraylist Of itemType):] The optional class name in parentheses denotes a virtual constructor method. See "Usage notes," below, for more information about invoking a collection constructor.
itemList A comma-delimited set of a combination of one or more of these:
  • Values or variables of the same type as specified on the al declaration
  • Collections of objects of the same type as specified on the al declaration

Each of these, from left to right, becomes an item or items in the resultant new Arraylist, al.

The ability to include a collection in itemList was added in Sirius Mods 7.9.

Usage notes

  • List is a virtual constructor and as such can be called with no method object, with an explicit class name, or with an object variable, even if that object is null:

    %al = List(items) %al = %(Arraylist of float):List(items) %al = %al:List(items)

    Note: As shown above, when explicitly indicating the class, both the collection and the item datatype must be specified just as they are on the collection variable's declaration:

    %al is collection Arraylist of longstring %al = %(Arraylist of longstring):List('Jack', 'and', 'Jill')

  • The maximum number of items values is 62.
  • You can also use the List method in contexts where an Arraylist object is a method parameter.
  • List is available in Sirius Mods Version 7.3 and later.

Examples

Creating an Arraylist of numbers

The following List method call creates a new Arraylist instance of 11 integer items that begins with 1 and whose subsequent items are, respectively, the sum of the preceding two integers:

%fib is collection arraylist of float %fib = list(1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89)

Creating an Arraylist of objects

The following List call creates a new Arraylist instance whose items are objects of user class freight:

class freight public variable a is float variable b is float constructor newf(%a is float, %b is float) end public ... end class ... %ark is arraylist of object freight %ark = list(newf(11, 14), newf(4, 6), newf(9, 77), - newf(-7, 1234))

Creating an Arraylist from objects and Arraylists

Under Sirius Mods 7.9 and later it is possible to include collections in the list of items being added. If a collection is in the list, each item in the collection is added to the target Arraylist. The following List call creates a new Arraylist instance whose items are objects of user class freight, some of them from existing Arraylists %ark1 and %ark2 and some newly created objects.

class freight public variable a is float variable b is float constructor newf(%a is float, %b is float) end public ... end class ... %ark is arraylist of object freight %ark1 is arraylist of object freight %ark2 is arraylist of object freight %ark = list(newf(11, 14), %ark1, newf(9, 77), %ark2, - newf(-7, 1234))

See also