class Person {
    def name
    def alter

    def printIfAdult() {
        if (this.alter > 17) {
            println this.name + " ist volljährig."
        }
    }
}

def personen = [new Person(name: "Max", alter: 12), new Person(name: "Karl", alter: 40), new Person(name: "Laura", alter: 23), new Person(name: "Ali", alter: 15)]

// Hier den Spread-Operator benutzen
personen*.printIfAdult()