pub main isp ring args int string class for

打印出如下圖案（菱形）
*
***
******
********
******
***
*

public class Example19 {
public static void main(String[] args) {
display(5);
}

public static void display(int h) {
for (int i = 0; i < (h + 1) / 2; i++) {
for (int j = 0; j < h / 2 - i; j++) {

System.out.print(" ");
}
for (int k = 1; k < (i + 1) * 2; k++) {
System.out.print("*");
}
System.out.println();
}
for (int i = 1; i <= h / 2; i++) {
for (int j = 1; j <= i; j++) {
System.out.print(" ");
}
for (int j = 0; j < h - 2 * i; j++) {
System.out.print("*");
}
System.out.println();
}
}
}

Java經典編程題50道之十九