如何在groovy中对多值列表进行排序？

def list = [5, 2, 8, 1, 9]
list.sort()
println list

def list = [5, 2, 8, 1, 9]
list.sort().reverse()
println list

class Person implements Comparable<Person> {
    String name
    int age

    int compareTo(Person other) {
        if (age < other.age) {
            return -1
        } else if (age > other.age) {
            return 1
        } else {
            return 0
        }
    }
}

def list = [new Person(name: 'Alice', age: 25), new Person(name: 'Bob', age: 30), new Person(name: 'Charlie', age: 20)]
list.sort()
println list*.name