Kotlin语言基础入门：Kotlin的常用写法

fun someFunction(a: Int = 0, b: String = "") { /* 方法实现 */ }

val list = Arrays.asList(1, 2, 3, 4, 5, 6, 7)
val bigger = list.filter { x -> x > 5 }
println(bigger) // [6, 7]

val list = Arrays.asList(1, 2, 3, 4, 5, 6, 7)
val bigger = list.filter { it > 2 }
println(bigger) // [3, 4, 5, 6, 7]

val nameList = Arrays.asList("Tom", "Rust Fisher", "Jerry")
if ("Rust Fisher" in nameList) {
    println("Rust Fisher在列表中")
}
if ("David" !in nameList) {
    println("David不在列表中")
}

val firstName = "Rust"
val lastName = "Fisher"
println("$firstName $lastName")

val readOnlyList = listOf("a", "b")

val map = mapOf("a" to 1, "b" to 2, "c" to 3)

int len = 0;
while((len = inputStream.read(tmp)) != -1) { /* 流操作 */ }

while (((inputStream.read(tmp)).also { len = it }) != -1) { /* 流操作 */ }