```
public class Solution {
public boolean isStrobogrammatic(String num) {
int i = 0 , j = num.length() - 1;
while(j >= i){
if(!isPair(num.charAt(i), num.charAt(j)))
return false;
i++;
j--;
}
return true;
}
public boolean isPair(int a, int b){
if((a == '1' && b == '1')
|| (a == '6' && b == '9')
|| (a == '8' && b == '8')
|| (a == '9' && b == '6')
|| (a == '0' && b == '0'))
return true;
return false;
}
}
```