在 Java 中使用分隔符(与拆分相反)连接数组元素的快速简便方法 [英] A quick and easy way to join array elements with a separator (the opposite of split) in Java

问题描述

参见相关.NET问题

我正在寻找一种与拆分完全相反的快速简便的方法这样它就会导致 ["a","b","c"] 变成 "a,b,c"

I'm looking for a quick and easy way to do exactly the opposite of split so that it will cause ["a","b","c"] to become "a,b,c"

遍历数组需要添加条件(如果这不是最后一个元素，则添加分隔符)或使用子字符串删除最后一个分隔符.

Iterating through an array requires either adding a condition (if this is not the last element, add the seperator) or using substring to remove the last separator.

我确定有一种经过认证的有效方法(Apache Commons?)

I'm sure there is a certified, efficient way to do it (Apache Commons?)

你更喜欢在你的项目中如何做?

How do you prefer doing it in your projects?

推荐答案

使用 Java 8，您可以以一种非常干净的方式做到这一点:

Using Java 8 you can do this in a very clean way:

String.join(delimiter, elements);

这以三种方式起作用:

1) 直接指定元素

String joined1 = String.join(",", "a", "b", "c");

2) 使用数组

String[] array = new String[] { "a", "b", "c" };
String joined2 = String.join(",", array);

3) 使用可迭代对象

List<String> list = Arrays.asList(array);
String joined3 = String.join(",", list);

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