public class HelloWorld {
public static void main(String[] args) {
String s = "aljlkdsflkjsadjfklhasdkjlflkajdflwoiudsafhaasdasd";
s1=s.toString();
int num = 0;
for (int i=0;i<s1.length;i++ )
{
if (s1[i]=='a' ) {
num++; }
}System.out.println("字符a出现的次数：" + num);}
}
