2025/1/8

// 定义一个类
class Person(val name: String, val age: Int)

// 使用集合操作
val numbers = List(1, 2, 3, 4, 5)
val doubled = numbers.map(_ * 2)
val filtered = numbers.filter(_ % 2 == 0)
println(s"Doubled: $doubled")
println(s"Filtered: $filtered")