复杂java圣诞树代码

// 复杂Java圣诞树代码
public class ChristmasTree {
    public static void main(String[] args) {
        int n = args.length > 0 ? Integer.parseInt(args[0]) : 5;
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n - i; j++) {
                System.out.print(" ");
            }
            for (int k = 0; k < 2 * i + 1; k++) {
                System.out.print("*");
            }
            System.out.println();
        }
        for (int i = 0; i < n - 1; i++) {
            System.out.print(" ");
        }
        System.out.println("*");
    }
}