Java/Patterns.java at main · Neerajkaushik07/Java · GitHub

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public class Patterns {

    public static void hollow_rectangle(int totrows, int totcolumns) {

        for (int i = 1; i <= totrows; i++) {
            for (int j = 1; j <= totcolumns; j++) {
                if (i == 1 || i == totrows || j == 1 || j == totcolumns) {
                    System.out.print(" * ");
                } else {
                    System.out.print("   ");
                }
            }
            System.out.println();
        }
    }

    public static void inverted_rotated_half_pyramid(int n) {

        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= n - i; j++) {
                System.out.print(" ");
            }
            for (int j = 1; j <= i; j++) {
                System.out.print("*");
            }
            System.out.println();
        }
    }

    public static void inverted_half_pyramid(int n) {

        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= n - i + 1; j++) {
                System.out.print(" * ");
            }
            System.out.println();
        }
    }

    public static void floyd_triangle(int n) {
        int counter = 1;

        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= i; j++) {
                System.out.print(counter + " ");
                counter++;
            }
            System.out.println();
        }
    }

    public static void zero_one_triangle(int n) {

        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= i; j++) {
                if ((i + j) % 2 == 0) {
                    System.out.print("1");
                } else {
                    System.out.print("0");
                }
            }
            System.out.println();
        }
    }

    public static void butterfly(int n) {

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

        for (int i = n; i >= 1; i--) {
            for (int j = i; j >= 1; j--) {
                System.out.print(" * ");
            }
            for (int j = 2 * (n - i); j >= 1; j--) {
                System.out.print("   ");
            }
            for (int j = i; j >= 1; j--) {
                System.out.print(" * ");
            }

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

    public static void solid_rhombus(int n) {

        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= n - i; j++) {
                System.out.print("   ");
            }
            for (int j = 1; j <= n; j++) {
                System.out.print(" * ");
            }
            System.out.println();
        }
    }

    public static void hollow_rhombus(int n) {

        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= n - i; j++) {
                System.out.print("   ");
            }
            for (int j = 1; j <= n; j++) {
                if (i == 1 || i == n || j == 1 || j == n) {
                    System.out.print(" * ");
                } else {
                    System.out.print("   ");
                }
            }
            System.out.println();
        }
    }

    public static void diamond(int n) {

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

        for (int i = n; i >= 1; i--) {
            for (int j = n - i; j >= 1; j--) {
                System.out.print("   ");
            }
            for (int j = (2 * i) - 1; j >= 1; j--) {
                System.out.print(" * ");
            }
            System.out.println();
        }
    }

    public static void main(String[] args) {

        hollow_rectangle(5, 5);
        inverted_rotated_half_pyramid(5);
        inverted_half_pyramid(5);
        floyd_triangle(5);
        zero_one_triangle(5);
        butterfly(5);
        solid_rhombus(5);
        hollow_rhombus(5);
        diamond(5);
    }
}