Java 如何检查输入中的反斜杠？
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How to check for back slash in input?
提问by Primal Pappachan
I have to check for character sequences like \chapter{Introduction} from the strings read from a file. To do this I have to first check for the occurence of backslash.
我必须从文件中读取的字符串中检查字符序列，如 \chapter{Introduction}。为此，我必须首先检查是否出现反斜杠。
This is what I did
这就是我所做的
final char[] chars = strLine.toCharArray();
char c;
for(int i = 0; i<chars.length; i++ ){
c = chars[i];
if(c == '\' ) {
}
}
But the backslash is treated as an escape sequence rather than a character.
但是反斜杠被视为转义序列而不是字符。
Any help on how to this would be much appreciated.
任何有关如何做到这一点的帮助将不胜感激。
采纳答案by BalusC
The backward slash is an escape character. If you want to represent a real backslach, you have to use two backslashes (it's then escaping itself). Further, you also need to denote characters by singlequotes, not by doublequotes. So, this should work:
反斜杠是转义字符。如果你想代表一个真正的反斜杠，你必须使用两个反斜杠（然后它自己转义）。此外，您还需要用单引号而不是双引号来表示字符。所以，这应该有效：
if (c == '\')
See also:
也可以看看：
回答by David Z
A backslash character can be represented in Java source code as '\\'.
反斜杠字符可以在 Java 源代码中表示为'\\'.
final char[] chars = strLine.toCharArray();
for (int i = 0; i < chars.length; i++) {
if (chars[i] == '\') {
// is a backslash
}
}
回答by bedwyr
You might also consider using the contains()and/or indexOf()methods for String. They will save you the trouble of iterating over each character in any given line.
您也可以考虑使用contains()和/或indexOf()方法String。它们将为您省去在任何给定行中迭代每个字符的麻烦。
Here's an example:
下面是一个例子：
public class Test {
public static void main(String[] args) {
if(args.length < 1) {
System.out.println("java Test string1 string2 ...");
System.exit(1);
}
for (String inputStr : args) {
if(inputStr.contains("\")) {
System.out.println("Found at: " + inputStr.indexOf("\"));
}
}
}
}
