打印菱形

这是一道简单的打印图形题

public class Test1 {

	public static void main(String[] args) {
		for (int i = 1; i <= 4; i++) {//通过循环打印上半区
			for (int k = 1; k <= 4-i; k++) {//通过循环打印空格
				System.out.print(" ");
			}
			for (int j = 1; j <= 2*i-1; j++) {//通过循环打印*
				System.out.print("*");
			}			
			System.out.println();//换行
		}
		for (int i = 3; i >0; i--) {//通过循环打印下半区
			for (int k = 1; k <= 4-i; k++) {
				System.out.print(" ");
			}
			for (int j = 2*i-1; j >0; j--) {
				System.out.print("*");
			}
			System.out.println();
		}
	}

}