Hello Friend,

Try the following code:

class Probability{

static int count(char c, String str) {
if (str == null) return 0;
int cnt = 0;
for (int i = 0;; cnt++) {
if ((i = str.indexOf(c,i)+1) == 0) break;
}
return cnt;
}

public static void main(String[] args){
String cut = "ahlllaaaa";
String s = cut.replaceAll((String.format("(.)(?<=(?:(?=\\1).).{0,%d}(?:(?=\\1).))", cut.length())), "");
String st=s.replace(" ","");
int len=cut.length();
char character[]=st.toCharArray();
char ch=' ';
for(int i=0;i<character.length;i++){
ch=character[i];
int c= count(ch,cut);
System.out.println("p("+ch+")="+c+"/"+len);
}
}
    }

Thanks