java基础api小问题随便给解决一下

Question

string a=“csagmtacsmgtcs”;问计算cs的个数求大神代码

Answer 1

Pattern p = Pattern.compile("cs");
Matcher m = p.matcher("csagmtacsmgtcs");
int sum = 0;
while(m.find()) {
sum ++;
}
System.out.println(sum);