Java输出金字塔

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：