Question

我正在尝试Kotlin的一些基础知识->

程序：

fun createDate(day: Int, month: Int, year: Int, hour: Int = 0, minute: Int = 0, second: Int = 0) {
print("TEST", "$day-$month-$year $hour:$minute:$second")
}
createDate(1,7,1997)

错误：

error: none of the following functions can be called with the arguments supplied: 
@InlineOnly public inline fun print(message: Any?): Unit defined in kotlin.io
@InlineOnly public inline fun print(message: Boolean): Unit defined in kotlin.io
@InlineOnly public inline fun print(message: Byte): Unit defined in kotlin.io
@InlineOnly public inline fun print(message: Char): Unit defined in kotlin.io
@InlineOnly public inline fun print(message: CharArray): Unit defined in kotlin.io
@InlineOnly public inline fun print(message: Double): Unit defined in kotlin.io
@InlineOnly public inline fun print(message: Float): Unit defined in kotlin.io
@InlineOnly public inline fun print(message: Int): Unit defined in kotlin.io
@InlineOnly public inline fun print(message: Long): Unit defined in kotlin.io
@InlineOnly public inline fun print(message: Short): Unit defined in kotlin.io
print("TEST", "$day-$month-$year $hour:$minute:$second")

不知道我在做什么错，我一直在关注-> https://www.toptal.com/software/kotlin-android-language

Answer 1

应该是这样，因为kotlin的默认打印功能只有一个参数

fun createDate(day: Int, month: Int, year: Int, hour: Int = 0, minute: Int = 0, second: Int = 0) {
    print("$day-$month-$year $hour:$minute:$second")
}

因为象这样的kotlin默认打印功能

/** Prints the given message and newline to the standard output stream. */
public expect fun println(message: Any?)

 /** Prints the given message to the standard output stream. */
public expect fun print(message: Any?)

所以您不能在打印功能中发送双重参数。请使用

print("$day-$month-$year $hour:$minute:$second")

代替

print("TEST", "$day-$month-$year $hour:$minute:$second")

Answer 2

在线错误

createDate(1,7,1997)

因为您调用了createDate（）函数，但是参数是不匹配。

让我们覆盖此功能：

createDate(1,7,1997,5,24,15)

使用kotlin错误提供的参数无法调用以下任何函数

2 个答案: