在 kotlin 源代码中,我无法理解如何实现 String.kt 的长度,如下所示:
package kotlin
public class String : Comparable<String>, CharSequence {
companion object {}
/**
* Returns a string obtained by concatenating this string with the string representation of the given [other] object.
*/
public operator fun plus(other: Any?): String
public override val length: Int
public override fun get(index: Int): Char
public override fun subSequence(startIndex: Int, endIndex: Int): CharSequence
public override fun compareTo(other: String): Int}
var len:Int = "abc".length; // len = 3 where to run the length??
在哪里实现长度功能?