ConditionsLoopsTask5RhombusPrinter.java

package HomeWorkSecond;

/**
 * Created by Andrey on 09.01.2016.
 */
public class ConditionsLoopsTask5RhombusPrinter {

    public static final String S_POINT = " . ";
    public static final String S_STAR = " * ";

    public static void main(String[] args) {
        int size = 7;
        printRhombus(size);
    }

    public static void printRhombus(int size) {

        checkSize(size);
        int middle = size / 2 + 1;
        int rightStar = middle;
        int leftStar = middle;
        for (int i = 1; i <= size; i++) {
            if (i < middle) {
                printUpRhombus(leftStar, rightStar, size);
                rightStar++;
                leftStar--;
            }
            if (i >= middle) {
                printBottomRhombus(leftStar, rightStar, size);
                rightStar--;
                leftStar++;
            }
            System.out.println();
        }
    }

    public static void printBottomRhombus(int leftStar, int rightStar, int size) {

        for (int j = size; j >= 1; j--) {
            if (rightStar == j || leftStar == j) {
                System.out.print(S_STAR);
            } else {
                System.out.print(S_POINT);
            }
        }
    }

    public static void printUpRhombus(int leftStar, int rightStar, int size) {

        for (int j = 1; j <= size; j++) {
            if (rightStar == j || leftStar == j) {
                System.out.print(S_STAR);
            } else {
                System.out.print(S_POINT);
            }
        }
    }

    public static void checkSize(int size) {
        int n = size % 2;
        if (size < 0 && n == 0) throw new IllegalArgumentException();
        return;
    }
}