Java的String []的Kotlin等效项是什么? [英] What's the Kotlin equivalent of Java's String[]?

问题描述

我看到Kotlin具有ByteArray, ShortArray, IntArray, CharArray, DoubleArray, FloatArray，与Java中的byte[], short[], int[],char[], double[], float[]等效.

I see that Kotlin has ByteArray, ShortArray, IntArray, CharArray, DoubleArray, FloatArray, which are equivalent to byte[], short[], int[],char[], double[], float[] in Java.

现在我想知道，有没有与Java的String[]等效的StringArray?

Now I'm wondering, is there any StringArray equivalent to Java's String[]?

推荐答案

String没有特殊情况，因为String是JVM上的普通引用类型，与Java原语(int，double，...)-将它们存储在参考 Array<T> 需要 IntArray 是存储非装箱的原语，从而消除了装箱和拆箱的开销(与Java int[]而不是Integer[]相同).

There's no special case for String, because String is an ordinary referential type on JVM, in contrast with Java primitives (int, double, ...) -- storing them in a reference Array<T> requires boxing them into objects like Integer and Double. The purpose of specialized arrays like IntArray in Kotlin is to store non-boxed primitives, getting rid of boxing and unboxing overhead (the same as Java int[] instead of Integer[]).

您可以使用Array<String>(对于可为空值使用Array<String?>)，这与Java中的String[]等效:

You can use Array<String> (and Array<String?> for nullables), which is equivalent to String[] in Java:

val stringsOrNulls = arrayOfNulls<String>(10) // returns Array<String?>
val someStrings = Array<String>(5) { "it = $it" }
val otherStrings = arrayOf("a", "b", "c")

另请参见:语言参考中的 数组

See also: Arrays in the language reference

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