创建DTO(POJO/POCO)
data class Customer(val name: String, val email: String, val company: String)
该类提供给如下功能：
getters(如果变量为var，则还会生成对应的setters)equals()hashCode()toString()copy()-
component1(),component2(), …,
函数参数的默认值
fun foo(a: Int = 0, b: String = "test") {
println("a is $a,b is $b")
}
foo() // a is 0,b is test
foo(1) // a is 1,b is test
foo(1, "success") // a is 1,b is success
过滤列表
val list: List<Int> = listOf(1, 2, 4, 5, 1, 3)
val newList = list.filter { x -> x > 2 }
// val newList = list.filter { it > 2 }
println(newList) // [2, 4, 2]
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