1. 雪花形状金字塔

public static void main(String[] args) {int i, j, k, n;Scanner sc = new Scanner(System.in);System.out.print("请输入金字塔层数：");n = sc.nextInt();//外层循环控制层数for (i = 1; i <= n; i++) {//根据外层行号，输出星号左边的空格for (j = 1; j <= n - i; j++) {System.out.printf(" ");}//根据外层行号，输出星号个数for (k = 1; k <= 2 * i - 1; k++) {System.out.print("*");}//一行结束，换行System.out.print("\n");}}

运行结果：

2. 数字增加形状的金字塔

public static void main(String[] args) {int n;Scanner sc = new Scanner(System.in);System.out.print("请输入金字塔层数：");n = sc.nextInt();for (int i = 1; i <= n; i++) {for (int j = i; j < n; j++) {System.out.print("\t");}for (int j = i; j >= 1; j--) {System.out.print(j + "\t");}for (int j = 2; j <= i; j++) {System.out.print(j + "\t");}System.out.println();}}

运行结果：