圣诞节来了，打印一颗圣诞树送给程序员

package com.mfl.demo;

import java.util.Scanner;

public class Christ {

/**

* 圣诞节来了，打印一颗圣诞树送给程序员

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

Christ temp = new Christ();

System.out.println("请输入您需要的圣诞树的大小<数字>");

Scanner input = new Scanner(System.in);

int a = input.nextInt();

temp.ChristmasTree(2 * a);

}

void ChristmasTree(int n) {

int i, j, k, m;

for (i = 1; i <= n / 2; i++) {

for (j = 1; j < n / 2 + i; j++) {

if (j <= n / 2 - i)

System.out.print(" ");

else {

if (j % 2 == 0)

System.out.print("$");

else

System.out.print("*");

}

}

System.out.print("\n");

}

for (k = n / 2 + 1; k <= n - n / 4; k++) {

for (m = 1; m <= n + 1; m++) {

if (m != n / 2)

System.out.print(" ");

else

System.out.print("||");

}

System.out.print("\n");

}

}

}