android-Kotlin小魔术

字符串内嵌表达式

"hello, $name. nice to meet you!"

val brand = "Samsung"

val price = 1299.99

println("brand=$brand, price=$price")

函数的参数默认值

这里与python类似

fun printParams(num: Int, str: String = "hello") {

println("num is $num , str is $str")

}

fun main() {

printParams(123)

}

fun printParams(num: Int = 100, str: String) {

println("num is $num , str is $str")

}

fun main() {

printParams(str = "world")

}