如何从 Java 中的特定字符串中删除特定字符？
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How do I delete specific characters from a particular String in Java?
提问by Slavisa Perisic
For example I'm extracting a text String from a text file and I need those words to form an array. However, when I do all that some words end with comma (,) or a full stop (.) or even have brackets attached to them (which is all perfectly normal).
例如，我从文本文件中提取一个文本字符串，我需要这些词来形成一个数组。但是，当我完成所有这些操作时，有些单词以逗号 (,) 或句号 (.) 结尾，甚至连括号（这都是完全正常的）。
What I want to do is to get rid of those characters. I've been trying to do that using those predefined String methods in Java but I just can't get around it.
我想做的是摆脱这些角色。我一直在尝试使用 Java 中的那些预定义 String 方法来做到这一点，但我无法绕过它。
采纳答案by OMG Ponies
Use:
用：
String str = "whatever";
str = str.replaceAll("[,.]", "");
replaceAlltakes a regular expression. This:
replaceAll采用正则表达式。这个：
[,.]
...looks for each comma and/or period.
...查找每个逗号和/或句点。
回答by bmargulies
You can't modify a String in Java. They are immutable. All you can do is create a new string that is substring of the old string, minus the last character.
您不能在 Java 中修改字符串。它们是不可变的。您所能做的就是创建一个新字符串，该字符串是旧字符串的子字符串，减去最后一个字符。
In some cases a StringBuffer might help you instead.
在某些情况下，StringBuffer 可能会帮助您。
回答by Mark Byers
Reassign the variable to a substring:
将变量重新分配给子字符串：
s = s.substring(0, s.length() - 1)
Also an alternative way of solving your problem: you might also want to consider using a StringTokenizerto read the file and set the delimiters to be the characters you don't want to be part of words.
还有一种解决问题的替代方法：您可能还需要考虑使用StringTokenizer读取文件并将分隔符设置为您不想成为单词一部分的字符。
回答by Chandra Patni
Note that the word boundaries also depend on the Locale. I think the best way to do it using standard java.text.BreakIterator. Here is an example from the java.sun.com tutorial.
请注意，单词边界也取决于语言环境。我认为最好的方法是使用标准的 java.text.BreakIterator。这是 java.sun.com 教程中的一个示例。
import java.text.BreakIterator;
import java.util.Locale;
public static void main(String[] args) {
String text = "\n" +
"\n" +
"For example I'm extracting a text String from a text file and I need those words to form an array. However, when I do all that some words end with comma (,) or a full stop (.) or even have brackets attached to them (which is all perfectly normal).\n" +
"\n" +
"What I want to do is to get rid of those characters. I've been trying to do that using those predefined String methods in Java but I just can't get around it.\n" +
"\n" +
"Every help appreciated. Thanx";
BreakIterator wordIterator = BreakIterator.getWordInstance(Locale.getDefault());
extractWords(text, wordIterator);
}
static void extractWords(String target, BreakIterator wordIterator) {
wordIterator.setText(target);
int start = wordIterator.first();
int end = wordIterator.next();
while (end != BreakIterator.DONE) {
String word = target.substring(start, end);
if (Character.isLetterOrDigit(word.charAt(0))) {
System.out.println(word);
}
start = end;
end = wordIterator.next();
}
}
Source: http://java.sun.com/docs/books/tutorial/i18n/text/word.html
来源：http: //java.sun.com/docs/books/tutorial/i18n/text/word.html
回答by fastcodejava
You can use replaceAll()method :
您可以使用replaceAll()方法：
String.replaceAll(",", "");
String.replaceAll("\.", "");
String.replaceAll("\(", "");
etc..
等等..
回答by Tom Neyland
To remove the last character do as Mark Byerssaid
要删除最后一个字符，请按照Mark Byers所说
s = s.substring(0, s.length() - 1);
Additionally, another way to remove the characters you don't want would be to use the .replace(oldCharacter, newCharacter)method.
此外，另一种删除不需要的字符的.replace(oldCharacter, newCharacter)方法是使用该方法。
as in:
如：
s = s.replace(",","");
and
和
s = s.replace(".","");
回答by AlexGach
The best method is what Mark Byers explains:
最好的方法是 Mark Byers 解释的：
s = s.substring(0, s.length() - 1)
For example, if we want to replace \ to space " " with ReplaceAll, it doesn't work fine
例如，如果我们想用 ReplaceAll 将 \ 替换为空格“”，则无法正常工作
String.replaceAll("\", "");
or
或者
String.replaceAll("\$", ""); //if it is a path
