java 如何替换空字符
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how to replace the null character
提问by Rakesh
In java ,i have editfield whcih takes its input ,in it we can enter 3 digits
在java中，我有editfield whcih接受它的输入，我们可以在其中输入3位数字
when i enter first and third ,leaving 2 digit empty ,how to remove empty digit thanks
当我输入第一个和第三个时，留下 2 个数字为空，如何删除空数字谢谢
回答by Roberto Aguayo Ph D IT
The null character is a character like all others. Its value as a byte is 0. Use \0 to identify it. (Same in C, Perl, C++, C#, etc).
空字符与所有其他字符一样。它作为一个字节的值为 0。使用 \0 来标识它。（在 C、Perl、C++、C# 等中也是如此）。
Java:
爪哇：
String noSpaces = perhapsSpaces.replaceAll("\0", " ");
String noSpaces = perhapsSpaces.replaceAll("\0", " ");
System.out.print(noSpaces + "\n");
System.out.print(noSpaces + "\n");
Perl:
珀尔：
$perhapsSpaces =~ s/\0/ /g;
$perhapsSpaces =~ s/\0/ /g;
print $perhapsSpaces . "\n";
print $perhapsSpaces . "\n";
回答by GaryF
If you want to remove all white space internally in a String (which is what I think you're asking), then you want something like:
如果您想在 String 内部删除所有空格（这就是我认为您要问的），那么您需要以下内容：
sText.replaceAll("\s+", "")
Hope that helps.
希望有帮助。
回答by Mirvnillith
Stripping spaces from a String (don't know if J2ME has StringBuilder so I'll just do ugly String concatenation):
从字符串中去除空格（不知道 J2ME 是否有 StringBuilder 所以我只会做丑陋的字符串连接）：
String noSpaces = "";
for (int i=0; i<perhapsSpaces.length(); i++)
{
if (perhapsSpaces.charAt(i) != ' ')
noSpaces += perhapsSpaces.charAt(i);
}
For "better" space handling, perhaps Character.isWhitespace?
为了“更好的”空间处理，也许 Character.isWhitespace？
回答by Brian Agnew
If you've got "X_Y" ("_" indicating a missing character) and you want "XY", then
如果你有 " X_Y" (" _" 表示缺少字符) 并且你想要 "XY"，那么
String newString = entered.charAt(0) + entered.charAt(2)
is the simplest way. But that's only useful for this one particular case. Do you not want to handle missing beginning and end characters too ?
是最简单的方法。但这仅对这种特殊情况有用。您是否也不想处理丢失的开始和结束字符？
