Rhombus

public class rhombus {

    public static void main(String[] args) {
        String star = "* ";
        String blank = " ";
        for (int i = 1; i <= 5; i++) {
            for (int j = 1; j <= 10 - 2 * i; j++) {
                System.out.print(blank);
            }
            for (int k = 1; k <= 2 * i - 1; k++) {
                System.out.print(star);
            }
            System.out.println();
        }
        for (int i = 4; i >= 1; i--) {
            for (int j = 1; j <= 10 - 2 * i; j++) {
                System.out.print(blank);
            }
            for (int k = 1; k <= 2 * i - 1; k++) {
                System.out.print(star);
            }
            System.out.println();
        }
    }
}