public class NewClass {
  public static void main(String args[])
  {
    boolean curPrime = true;    //check to see if it's true

    //we will be printing out the numbers later
    //we just don't want to have this print in the loop
    System.out.print("The prime numbers are: ");
    
    //the for loop for checking each number
    //you can omit 1 because it is not a prime number!
    for(int i=2;i<=20;i++)
    {
      curPrime = true;          //number is innocent until proven guilty

      //loop to seek first number
      for(int j=1;j<i;j++)
      {
        //loop to seek second number
        for(int k=0;k<=j;k++)
        {
          //if both numbers equal i
          if(j*k == i)
          {
            curPrime = false;   //this criminal is NOT a prime number
          }
        }
      }
      
      //print out each number if it is prime
      if(curPrime)
      {
        System.out.print(i + " ");
      }
    }
    //it is good form to always end the line you print on
    System.out.println();
  }
}