It is straightforward looping , counting, concatenate, but without unnecessary checks..

The Idea is, we say the count of every similar sequential numbers

ex. 111221 : we have 3 ones(31) , 2 twos(22) , 1 one(11) = 312211

```
public static String countAndSay(int n) {
String current=new String("1");
StringBuilder result=new StringBuilder("1");
int count=0;
for(int i=1;i<n;i++) {
result=new StringBuilder();
for(int j=0;j<current.length();j++) {
count++;
if(j==current.length()-1 || current.charAt(j)!=current.charAt(j+1) ) {
result.append(count+""+current.charAt(j));
count=0;
}
}
current=result.toString();
}
return result.toString();
}
```