[英]How do I delete specific characters from a particular String in Java?
For example I'm extracting a text String from a text file and I need those words to form an array. 例如,我从文本文件中提取文本字符串,我需要这些字来形成一个数组。 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).
但是,当我做所有这些时,一些单词以逗号(,)或句号(。)结尾,或者甚至附加括号(这都是完全正常的)。
What I want to do is to get rid of those characters. 我想要做的就是摆脱那些角色。 I've been trying to do that using those predefined String methods in Java but I just can't get around it.
我一直试图在Java中使用那些预定义的String方法来做到这一点,但我无法解决它。
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 StringTokenizer to read the file and set the delimiters to be the characters you don't want to be part of words. 另外一种解决问题的方法是:您可能还需要考虑使用StringTokenizer来读取文件并将分隔符设置为您不希望成为单词的一部分的字符。
Use: 使用:
String str = "whatever";
str = str.replaceAll("[,.]", "");
replaceAll takes a regular expression . replaceAll采用正则表达式 。 This:
这个:
[,.]
...looks for each comma and/or period. ...查找每个逗号和/或句号。
To remove the last character do as Mark Byers said 要删除最后一个角色,请按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,另一种删除您不想要的字符的方法是使用
.replace(oldCharacter, newCharacter)
方法。
as in: 如:
s = s.replace(",","");
and 和
s = s.replace(".","");
You can't modify a String in Java. 您无法在Java中修改String。 They are immutable.
他们是不变的。 All you can do is create a new string that is substring of the old string, minus the last character.
您所能做的就是创建一个新字符串,它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。
The best method is what Mark Byers explains: Mark Byers解释说,最好的方法是:
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替换\\“space”,它就不能正常工作
String.replaceAll("\\", "");
or 要么
String.replaceAll("\\$", ""); //if it is a path
Note that the word boundaries also depend on the Locale. 请注意,单词边界也取决于区域设置。 I think the best way to do it using standard java.text.BreakIterator.
我认为使用标准java.text.BreakIterator进行此操作的最佳方法。 Here is an example from the java.sun.com tutorial.
以下是java.sun.com教程中的示例。
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 资料来源: http : //java.sun.com/docs/books/tutorial/i18n/text/word.html
You can use replaceAll()
method : 您可以使用
replaceAll()
方法:
String.replaceAll(",", "");
String.replaceAll("\\.", "");
String.replaceAll("\\(", "");
etc.. 等等..
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