要求：打印出一个菱形的字母，从字母A開始.

代码：

package com.huawei.mianshi;

public class Demo2 {
	private static int LINE = 4;
	public static void main(String[] args) {
		run();
	}

	private static void run() {
		//从大写字母A開始
		char A = ‘A‘;
		//循环的次数i=1代表第一行		
		for (int i = 1; i <= LINE; i++) {
			//打印空格
			for (int k = 1; k <= (LINE - i); k++)
				System.out.print(" ");
			//打印字母
			for (int j = 0; j < i; j++) {
				System.out.print(A++);
				System.out.print(" ");
			}
			//换行
			System.out.println();
		}
		//逆向打印
		for (int i = LINE; i >= 1; i--) {
			//打印空格
			for (int k = 1; k <= (LINE - i); k++)
				System.out.print(" ");
			//打印字母
			for (int j = 0; j < i; j++) {
				System.out.print(A++);
				System.out.print(" ");
			}
			//换行
			System.out.println();
		}
	}
}