题目:打印出如下图案(菱形)
*
***
******
********
******
***
*
public static void rhombus() {
for (int i = 1; i <= 4; i++) {
for (int j = i; j < 4; j++) {
System.out.print(" ");
}
for (int k = 1; k <= 2 * i - 1; k++) {
System.out.print("*");
}
System.out.println();
}
for (int i = 3; i >= 1; i--) {
for (int j = 1; j <= 4 - i; j++) {
System.out.print(" ");
}
for (int k = 2 * i - 1; k > 0; k--) {
System.out.print("*");
}
System.out.println();
}
}