Java - 计算字符串中的符号数
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Java - Count number of symbols in string
提问by test
Let's say I have this string:
假设我有这个字符串：
String helloWorld = "One,Two,Three,Four!";
How can I make it so it counts the number of commas in String helloWorld?
我怎样才能让它计算逗号的数量String helloWorld？
回答by corsiKa
the simplest way would be iterate through the String and count them.
最简单的方法是遍历字符串并计算它们。
int commas = 0;
for(int i = 0; i < helloWorld.length(); i++) {
if(helloWorld.charAt(i) == ',') commas++;
}
System.out.println(helloWorld + " has " + commas + " commas!");
回答by lukastymo
回答by Péter T?r?k
String[] tokens = helloWorld.split(",");
System.out.println("Number of commas: " + (tokens.length - 1));
回答by m0s
Not so simple but shorter way
不是那么简单而是更短的方式
String str = "One,Two,Three,Four!";
int num = str.replaceAll("[^,]","").length();
回答by Mahfuz Ahmed
If you can import com.lakota.utils.StringUtils then it's so simple. Import this> import com.lakota.utils.StringUtils;
如果您可以导入 com.lakota.utils.StringUtils 那就太简单了。导入这个>导入com.lakota.utils.StringUtils;
int count = StringUtils.countMatches("One,Two,Three,Four!", ",");
System.out.println("total comma "+ count);
