public static void main(String[] args) {
String s = "aljlkdsflkjsadjfklhasdkjlflkajdflwoiudsafhaasdasd";
int num = 0;
for (int i=0;i<s.length();i++)
{char str=s.charAt(i);
// 获取每个字符，判断是否是字符a
if (str=='a'){
num++; }}
System.out.println("字符a出现的次数：" + num);
}
}
