Problem 22 - Tampilkan 100 Bilangan Prima

class PrimeNumbers
{
   public static void main (String[] args)
   {  
       int i =0;
       int num =0;
       //Empty String
       String  primeNumbers = "";

       for (i = 1; i <= 100; i++)         
       {        
          int counter=0;    
          for(num =i; num>=1; num--)
   {
             if(i%num==0)
      {
   counter = counter + 1;
      }
   }
   if (counter ==2)
   {
      //Appended the Prime number to the String
      primeNumbers = primeNumbers + i + " ";
   } 
       } 
       System.out.println("Prime numbers from 1 to 100 are :");
       System.out.println(primeNumbers);
   }
}