use java

println "OwnLang array to Java array"
arr = toObject([1, 2, 4, 2, 0, 4, 3])
println arr

println "\nArrays.asList"
Arrays = newClass("java.util.Arrays")
list1 = Arrays.asList(arr)
println list1

println "\nStack"
Stack = newClass("java.util.Stack")
stack = new Stack()
stack.push(1)
stack.push(2)
stack.push(3)
println stack.pop()
println stack.pop()


println "\nArrayList from Stack"
ArrayList = newClass("java.util.ArrayList")
list2 = new ArrayList(stack)
list2.add(4)
for element : list2.toArray() {
  println element
}


println "\nHashSet"
HashSet = newClass("java.util.HashSet")
set = new HashSet(list1)
println set
containsFour = set.contains(4)
// NOTE: containsFour is java.lang.Boolean
println containsFour.getClass()
isContainsFour = toValue(containsFour)
if (isContainsFour) {
  println "Set contains 4"
}
for element : set.toArray() {
  println element
}