如何知道string里有多少个字符
发布网友
发布时间：2022-04-24 10:08
共1个回答
热心网友
时间：2023-10-09 21:19
java根据以下判断一个字符串中有几个，
1、判断长度"abc".length()
2、判断某个字符有几个
String a = "abbdfsads";
int n = a.length()-a.replaceAll("a", "").length();
System.out.println("字符串中字符a有"+n+"个");
/**
* Returns true if and only if this string contains the specified
* sequence of char values.
*
* @param s the sequence to search for
* @return true if this string contains <code>s</code>, false otherwise
* @throws NullPointerException if <code>s</code> is <code>null</code>
* @since 1.5
*/
public boolean contains(CharSequence s) {
return indexOf(s.toString()) > -1;
}
String str = "dfdf点点滴滴";
boolean b1 = str.contains("d");
boolean b2 = str.contains("点点滴滴");
