控制台用星号输出层数为n的菱形

public class Rhombus {

    public static void main(String[] args) {
        printRhombus(15);
    }

    /**
     * 用 * 号打印层数为 n 的菱形
     * @param lineNum 菱形层数
     */
    public static void printRhombus(int lineNum) {
        int asteriskNum = 1;
        for (int l = 1;l <= lineNum;l++) {
            int a = asteriskNum;
            int b = (lineNum - asteriskNum) / 2;
            while (b > 0 | a > 0) {
                if (b > 0) {
                    System.out.print(" ");
                    b--;
                } else {
                    System.out.print("*");
                    a--;
                }
            }
            System.out.print('\n');
            if (l + 1 <= (lineNum / 2) + 1) {
                asteriskNum = asteriskNum + 2;
            } else {
                asteriskNum = asteriskNum - 2;
            }
        }
    }

}