如何在 Java 中初始化长度为 0 的字符串数组?
该方法的 Java 文档String[] java.io.File.list(FilenameFilter 过滤器)
在退货说明中包含此内容:
The Java Docs for the method
String[] java.io.File.list(FilenameFilter filter)
includes this in the returns description:
如果目录为空或过滤器不接受任何名称，则数组将为空.
The array will be empty if the directory is empty or if no names were accepted by the filter.
我该如何做类似的事情并将字符串数组(或任何其他数组)初始化为长度为 0?
How do I do a similar thing and initialize a String array (or any other array for that matter) to have a length 0?
推荐答案
正如其他人所说，
new String[0]
确实会创建一个空数组.然而，数组有一个好处——它们的大小不能改变，所以你总是可以使用相同的空数组引用.所以在你的代码中，你可以使用:
will indeed create an empty array. However, there's one nice thing about arrays - their size can't change, so you can always use the same empty array reference. So in your code, you can use:
private static final String[] EMPTY_ARRAY = new String[0];
然后在每次需要时返回 EMPTY_ARRAY - 无需每次都创建新对象.
and then just return EMPTY_ARRAY each time you need it - there's no need to create a new object each time.
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