Java program to print an ASCII '*' diamond

DiamondThing.java

public class DiamondThing {
  static int MAX_ROW_LEN = 5; // should always be an odd num to work properly

  public static void main(String[] args) {
    // from i -> the max, add 2 everytime
    for (int currRowLen = 1; currRowLen <= MAX_ROW_LEN; currRowLen += 2) {

      // we need to do a little arithmetic to figure out how many spaces
      int numPrefixSpaces = MAX_ROW_LEN - currRowLen / 2;
      for (int space = 0; space < numPrefixSpaces; space++) {
        System.out.print(" ");
      }

      // print out the number of stars for our current row length
      for (int star = 0; star < currRowLen; star++) {
        System.out.print("*");
      }
      
      // print a newline after each row
      System.out.print("\n");
    }

    // from the max -> zero, subtract 2 everytime
    for (int currRowLen = MAX_ROW_LEN; currRowLen > 0; currRowLen -= 2) {

      // same as above for spaces
      int numPrefixSpaces = MAX_ROW_LEN - currRowLen / 2;
      for (int space = 0; space < numPrefixSpaces; space++) {
        System.out.print(" ");
      }

      // same as above for stars
      for (int star = 0; star < currRowLen; star++) {
        System.out.print("*");
      }

      // print a newline after each row
      System.out.print("\n");
    }
  }
}