Java split() 方法最后去除空字符串？
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Java split() method strips empty strings at the end?
提问by raja
Check out the below program.
看看下面的程序。
try {
for (String data : Files.readAllLines(Paths.get("D:/sample.txt"))){
String[] de = data.split(";");
System.out.println("Length = " + de.length);
}
} catch (IOException e) {
e.printStackTrace();
}
Sample.txt:
示例.txt：
1;2;3;4 A;B;; a;b;c;
Output:
输出：
Length = 4 Length = 2 Length = 3
Why second and third output is giving 2 and 3 instead of 4. In sample.txtfile, condition for 2nd and 3rd line is should give newline(\nor enter) immediately after giving delimiter for the third field. Can anyone help me how to get length as 4 for 2nd and 3rd line without changing the condition of the sample.txtfile and how to print the values of de[2](throws ArrayIndexOutOfBoundsException)?
为什么第二个和第三个输出是 2 和 3 而不是 4。在sample.txt文件中，第 2 行和第 3 行的条件是应该\n在为第三个字段提供分隔符后立即给出换行符（或输入）。任何人都可以帮助我如何在不更改sample.txt文件条件的情况下将第 2 行和第 3 行的长度设为 4以及如何打印de[2](throws ArrayIndexOutOfBoundsException)的值？
回答by Johannes Weiss
have a look at the docs, here the important quote:
看看文档，这里是重要的引用：
[...] the array can have any length, and trailing empty strings will be discarded.
If you don't like that, have a look at Fabian's comment. When calling String.split(String), it calls String.split(String, 0)and that discards trailing empty strings (as the docs say it), when calling String.split(String, n)with n < 0it won't discard anything.
如果您不喜欢那样，请查看 Fabian 的评论。当调用 时String.split(String)，它会调用String.split(String, 0)并丢弃尾随的空字符串（正如文档所说），当String.split(String, n)用n < 0它调用时不会丢弃任何东西。
回答by Fabian Steeg
You can specify to apply the pattern as often as possible with:
您可以指定尽可能频繁地应用该模式：
String[] de = data.split(";", -1);
See the Javadocfor the split method taking two arguments for details.
