This version is still in development and is not considered stable yet. For the latest stable version, please use Spring Framework 6.1.12! |
Inline Lists
You can directly express lists in an expression by using {}
notation.
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Java
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Kotlin
// evaluates to a Java list containing the four numbers
List numbers = (List) parser.parseExpression("{1,2,3,4}").getValue(context);
List listOfLists = (List) parser.parseExpression("{{'a','b'},{'x','y'}}").getValue(context);
// evaluates to a Java list containing the four numbers
val numbers = parser.parseExpression("{1,2,3,4}").getValue(context) as List<*>
val listOfLists = parser.parseExpression("{{'a','b'},{'x','y'}}").getValue(context) as List<*>
{}
by itself means an empty list. For performance reasons, if the list is itself
entirely composed of fixed literals, a constant list is created to represent the
expression (rather than building a new list on each evaluation).