Question

I’m trying to learn how to create simple groovy classes, which are not domain classes. I want to create a set of classes (and their objects) in my software but have no intention of saving to a database. Specifically, I have a question about how to create a class which has a property that is a list of a second class. like this:

class oParent{
    def fName
    def lName
    def listOfChildren
}
class oChild{
    def propertyOne
    def propertyTwo
}

So, with this example, I can create an object of each like this:

def p = new oParent();
def cOne = new oChild();
def cTwo = new oChild();

p.fName ="SomeName"
p.lName ="some Last Name"

cOne.propertyOne = "a"
cOne.propertyTwo = "b"

cTwo.propertyOne = "c"
cTwo.propertyTwo = "d"

So, how do i add each of the children objects (cOne and cTwo) to the parent object p). Once added, how would i then traverse the parent class’s children’s property and, for example, print all the propertyTwo properties for all children classes?

Answer 1

well, it turned out to be pretty simple, unless i’m doing it wrong. here is how i did it:

class oParent{
   def fName
   def lName
   def listOfChildren = []
}

class oChild{
   def propertyOne
   def propertyTwo
}

def p = new oParent();
def cOne = new oChild();
def cTwo = new oChild();

p.fName ="SomeName"
p.lName ="some Last Name"

cOne.propertyOne = "a"
cOne.propertyTwo = "b"

cTwo.propertyOne = "c"
cTwo.propertyTwo = "d"

p.listOfChildren.add(cOne)
p.listOfChildren.add(cTwo)

I can the iterate like this:

p.listOfChildren.each{ foo->
    log.debug(foo.propertyOne)
}