optional_item
required_item
v If you can choose from two or more items, they appear vertically, in a stack.
If you must choose one of the items, one item of the stack appears on the main
path.
required_item required_choice1
required_choice2
If choosing one of the items is optional, the entire stack appears below the main
path.
required_item
optional_choice1
optional_choice2
If one of the items is the default, it appears above the main path and the
remaining choices are shown below.
required_item
default_choice
optional_choice
optional_choice
v An arrow returning to the left, above the main line, indicates an item that can be
repeated.
required_item
repeatable_item
If the repeat arrow contains a comma, you must separate repeated items with a
comma.
required_item
,
repeatable_item
A repeat arrow above a stack indicates that you can repeat the items in the
stack.
v Sometimes a diagram must be split into fragments. The syntax fragment is
shown separately from the main syntax diagram, but the contents of the
fragment should be read as if they are on the main path of the diagram.
required_item fragment-name
fragment-name:
required_item
optional_name
xii Application Programming Guide and Reference for Java
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