class Main{
  public static void main(String[] a){
    rowofStars(0,7); // Expected: "       "
    rowofStars(1,7); // Expected: "   *   "
    rowofStars(2,7); // Expected: "  * *  "
    rowofStars(3,7); // Expected: "  ***  "
    rowofStars(4,7); // Expected: " ** ** "
    rowofStars(5,7); // Expected: " ***** "
    rowofStars(6,7); // Expected: "*** ***"
    rowofStars(7,7); // Expected: "*******"
  }
 
  static void rowofStars(int num, int length){
    // Create a character array with the given length:
    char[] charArray = new char[length];
 
    // Fill this entire array with spaces initially:
    java.util.Arrays.fill(charArray, ' ');
 
    // Fill the middle of the array with the appropriate amount of '*'
    // num amount of times for odd, and num+1 amount of times for even
    java.util.Arrays.fill(charArray, length/2 - num/2, length/2 + num/2 + 1, '*');
 
    // If the num was even, change the center spot back to a space:
    if(num%2 == 0)
      charArray[length/2] = ' ';
 
    // Convert the character-array to a String
    String result = new String(charArray);
 
    // And output the String:
    System.out.println(result);
  }
}

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