在控制台打印一个空心的菱形

public class TestDate {
	public static void main(String args[])
	{
		lingxing(15);
	}
	
	public static void lingxing(int height)
	{
		if(height % 2 == 0)
		{
			System.out.println("请输入一个奇数菱形长度");
			return;
		}
		int centerPointx = height / 2 + 1;
		for (int i = 1; i < height+1 ; i++) 
		{
			for (int j = 1; j < height+1 ; j++) 
			{
//				System.out.print(i +","+ j+".");
//				System.out.print("start:" + (Math.abs(i - centerPointx) + 1) + ",end:" + (height - Math.abs(i - centerPointx)));
				if(j == (Math.abs(i - centerPointx) + 1) || j == (height - Math.abs(i - centerPointx)))
				{
					printStart();
				}else
				{
					printBlank();
				}
			}
			nextLine();
		}
	}
	
	/**
	 * 打印个星星
	 */
	public static void printStart()
	{
		System.out.print("*");
	}
	
	/**
	 * 打印个空格
	 */
	public static void printBlank()
	{
		System.out.print(" ");
	}
	
	/**
	 * 换个行
	 */
	public static void nextLine()
	{
		System.out.println();
	}
}