java字符串中求字串的个数

    package z_1;

    public class Z_4 {
    /*
    * 计算某个字符串在另一个字符串中出现的次数
    */

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        String s="kkaaskkadidkkddspqlkk";
        getCount(s,"kk");
        sop(getCount(s,"kk"));
    }
    private static int getCount(String s, String string) {
        // TODO Auto-generated method stub
        int count=0;
        int index=0;
        while((index=s.indexOf(string))!=-1)
        {
            sop("s="+s);
            s=s.substring(index+string.length());
            count++;

        }
        return count;
    }
    private static void sop(String str) {
        // TODO Auto-generated method stub
        System.out.println(str);
    }

    }