java 如何计算字符串中的特殊字符
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how to count special character in a string
提问by sivanesan1
Possible Duplicate:
String Functions how to count delimiter in string line
可能的重复：
字符串函数如何计算字符串行中的分隔符
I have a string as str = "one$two$three$four!five@six$" now how to count Total number of "$" in that string using java code.
我有一个字符串 str = "one$two$three$four!five@six$" 现在如何使用java代码计算该字符串中“$”的总数。
回答by マルちゃん だよ
Using replaceAll:
使用 replaceAll：
String str = "one$two$three$four!five@six$";
int count = str.length() - str.replaceAll("\$","").length();
System.out.println("Done:"+ count);
Prints:
印刷：
Done:4
Using replaceinstead of replaceAllwould be less resource intensive. I just showed it to you with replaceAllbecause it can search for regexpatterns, and that's what I use it for the most.
使用replace而不是replaceAll会减少资源密集度。我刚刚用replaceAll向您展示了它，因为它可以搜索正则表达式模式，这就是我最常使用它的地方。
Note: using replaceAllI need to escape $, but with replacethere is no such need:
注意：使用replaceAll我需要转义$，但使用replace则不需要：
str.replace("$");
str.replaceAll("\$");
回答by Keppil
You can just iterate over the Charactersin the string:
您可以遍历Characters字符串中的 ：
String str = "one$two$three$four!five@six$";
int counter = 0;
for (Character c: str.toCharArray()) {
if (c.equals('$')) {
counter++;
}
}
回答by AncerHaides
String s1 = "one$two$three$four!five@six$";
String s2 = s1.replace("$", "");
int result = s1.length() - s2.length();
