Find the missing elements in the array - java program

public class MissingElement {

public static void main(String args[]){
int a[] = { 1,3,4,5,6,7,10 };
int j = a[0];
for (int i=0;i<a.length;i++)
{
   if (j==a[i])
   {
       j++;
       continue;
   }
   else
   {
      System.out.println(j);
       i--;
   j++;
   }
}


}
}

Out put :

 2
 8
 9