计算字符串中各字符的个数

public class test21 {
    public static void main(String[] args) {
        a("abnclnacnacipnsakkcnsa");
    }

    public static void a(String a){
        while (a.length()!=0){
            int count=a.length();
            char a0=a.charAt(0);
            String[] bs = a.split(String.valueOf(a.charAt(0)));
            if (bs.length!=0){//防止数组越界
            a=bs[0];
            for (int i = 1; i < bs.length; i++) {
                a=a.concat(bs[i]);
            }
            System.out.println(a0+"的个数为"+(count-a.length()));}

            else {
                System.out.println(a.charAt(0)+"的个数为"+a.length());
                break;
            }

        }

    }