java输入判断字符 java判断字符个数

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java根据以下判断一个字符串中有几个，32313133353236313431303231363533e4b893e5b19e31333365643662

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 s, false otherwise
* @throws NullPointerException if s is null
* @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");