java圣诞节圣诞树

以下是Java实现简单圣诞树的示例代码：

public class ChristmasTree {
    public static void main(String[] args) {
        int n = 10;
        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= n - i; j++) {
                System.out.print(" ");
            }
            for (int k = 1; k <= 2 * i - 1; k++) {
                System.out.print("*");
            }
            System.out.println();
        }
        for (int i = 1; i <= 3; i++) {
            for (int j = 1; j <= n - 2; j++) {
                System.out.print(" ");
            }
            System.out.println("***");
        }
    }
}

运行结果：

         *
        ***
       *****
      *******
     *********
    ***********
   *************
  ***************
 *****************
*******************
         ***
         ***
         ***