Java:拆分后获取最后一个元素 [英] Java: Get last element after split

问题描述

我正在使用字符串拆分方法，并且我想要最后一个元素.Array 的大小可以改变.

I am using the String split method and I want to have the last element. The size of the Array can change.

示例:

String one = "Düsseldorf - Zentrum - Günnewig Uebachs"
String two = "Düsseldorf - Madison"

我想拆分上面的字符串并得到最后一项:

I want to split the above Strings and get the last item:

lastone = one.split("-")[here the last item] // <- how?
lasttwo = two.split("-")[here the last item] // <- how?

我不知道运行时数组的大小:(

I don't know the sizes of the arrays at runtime :(

推荐答案

将数组保存在局部变量中，并使用数组的 length 字段来查找其长度.减去一个以说明它是基于 0 的:

Save the array in a local variable and use the array's length field to find its length. Subtract one to account for it being 0-based:

String[] bits = one.split("-");
String lastOne = bits[bits.length-1];

Caveat emptor:如果原始字符串仅由分隔符组成，例如 "-" 或 "---", bits.length 将为 0，这将引发 ArrayIndexOutOfBoundsException.示例:https://onlinegdb.com/r1M-TJkZ8

Caveat emptor: if the original string is composed of only the separator, for example "-" or "---", bits.length will be 0 and this will throw an ArrayIndexOutOfBoundsException. Example: https://onlinegdb.com/r1M-TJkZ8

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