在Kotlin中将ArrayList转换为字符串的最佳方法

问题描述

我在Kotlin中有一个String的ArrayList

I have an ArrayList of String in kotlin

private val list = ArrayList<String>()

我想用分隔符，"将其转换为String.我知道我们可以通过循环以编程方式完成此操作，但是在其他语言中，我们可以使用映射功能，就像在Java中一样

I want to convert it into String with a separator ",". I know we can do it programatically through loop but in other languages we have mapping functions available like in java we have

StringUtils.join(list);

在Swift中我们有

array.joined(separator:",");

有没有可用的方法将ArrayList转换为String? Kotlin中的分隔符?

Is there any method available to convert ArrayList to String with a separator in Kotlin?

然后添加自定义分隔符(例如-"等)怎么办?

And what about for adding custom separator like "-" etc?

推荐答案

Kotlin具有 joinToString 方法仅用于此目的

Kotlin has joinToString method just for this

list.joinToString()

您可以像这样更改分隔符

You can change a separator like this

list.joinToString(separator = ":")

如果要对其进行更多自定义，这些都是可以在此功能中使用的参数

If you want to customize it more, these are all parameters you can use in this function

val list = listOf("one", "two", "three", "four", "five")
println(
    list.joinToString(
        prefix = "[",
        separator = ":",
        postfix = "]",
        limit = 3,
        truncated = "...",
        transform = { it.toUpperCase() })
)

输出

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