38. Count and Say

public class Solution {
    public String countAndSay(int n) {
    StringBuilder curr=new StringBuilder("1");
    StringBuilder prev;
    int count;
    char say;
        for (int i=1;i<n;i++){
        prev=curr;
        curr=new StringBuilder();      
        count=1;
        say=prev.charAt(0);
       
        for (int j=1,len=prev.length();j<len;j++){
        if (prev.charAt(j)!=say){
        curr.append(count).append(say);
        count=1;
        say=prev.charAt(j);
        }
        else count++;
        }
        curr.append(count).append(say);
        }               
        return

curr.toString();
       
    }
}