| 表达式 | 翻译为 |
|---|---|
| +a | a.unaryPlus() |
| -a | a.unaryMinus() |
| !a | a.not() |
| a + b | a.plus(b) |
| a - b | a.minus(b) |
| a * b | a.times(b) |
| a / b | a.div(b) |
| a % b | a.rem(b)、 a.mod(b) （已弃用） |
| a..b | a.rangeTo(b) |
| a in b | b.contains(a) |
| a !in b | !b.contains(a) |
| a == b | a?.equals(b) ?: (b === null) |
| a != b | !(a?.equals(b) ?: (b === null)) |
| a > b | a.compareTo(b) > 0 |
| a < b | a.compareTo(b) < 0 |
| a >= b | a.compareTo(b) >= 0 |
| a <= b | a.compareTo(b) <= 0 |
| a() | a.invoke() |
| a(i) | a.invoke(i) |
| a(i, j) | a.invoke(i, j) |
| a(i_1, ……, i_n) | a.invoke(i_1, ……, i_n) |
unaryMinus
data class Point(val x: Int, val y: Int)
operator fun Point.unaryMinus() = Point(-x, -y)
val point = Point(10, 20)
fun main() {
println(-point) // 输出“Point(x=-10, y=-20)”
}
plus
data class Counter(val dayIndex: Int) {
operator fun plus(increment: Int): Counter {
return Counter(dayIndex + increment)
}
}
invoke
class Hello{
operator fun invoke(target: String) {
say()
println(target)
}
fun say() {
println("hello ")
}
}
fun main() {
val hello = Hello()
hello("world")
}
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