Java练习题01

5. 从键盘接收一个正整数，该正整数作为行数，输出以下图形 (正金字塔)
例如输入5
        *
       ***
      *****
     *******
    *********

import java.util.Scanner;

public class HomeWork05 {
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        String space = " ";
        String stars = "*";
        int n = in.nextInt();
        for(int i = 1; i <= n; i++){
            for(int j = 0; j < n - i; j++){
                System.out.print(space);
            }
            for(int k = 0; k < i * 2 - 1 ; k++){// 输出星号，星号个数=行号 * 2 - 1
                System.out.print(stars);
            }
            System.out.println();

        }
    }
}