Use java methods in groovy script

I am usually using "as BigDecimal"

Example:

def id = context.expand ('${testCaseProperties#id}') as BigDecimal

but I just tried and it works for Integer the same way.

def testnumber_one = "1"
log.info "testnumber_one has class: " + testnumber_one.getClass()

def testnumber_two = "4" as Integer
log.info "testnumber_two has class: " + testnumber_two.getClass()

• Tue Jun 13 16:34:21 CEST 2023: INFO: testnumber_one has class: class java.lang.String
• Tue Jun 13 16:34:21 CEST 2023: INFO: testnumber_two has class: class java.lang.Integer