java 实例，打印菱形

public class lingxing {
    public static void main(String[] args) {
        int i, j, k;
        for (i = 0; i < 5; i++) {
            for (j = 0; j < 5 - i; j++)
                System.out.print(" ");
            for (k = 0; k < 2 * i - 1; k++)
                System.out.print("*");
            System.out.println();

        }
        for (i = 3; i > 0; i--) {
            for (j = 0; j < 5 - i; j++)
                System.out.print(" ");
            for (k = 0; k < 2 * i - 1; k++)
                System.out.print("*");
            System.out.println();
        }

    }
}