Example: Left Arrow Pattern and Right Arrow Pattern in Java using Function

// Left Arrow Pattern and Right Arrow Pattern in Java using Function
import java.util.Scanner;

public class Main {
    // It's the driver method
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        Main main = new Main();

        int rows;

        System.out.println("-----Enter the number of rows to print the left & right arrows pattern-----");
        rows = in.nextInt();

        if (rows > 0) {
            // calling function to print the pattern
            main.leftRightArrowsPattern(rows);
        }
    }
    
    // It will print left arrow pattern and right arrow pattern
    int leftRightArrowsPattern(int rows) {
        int r, r1, c, row1;

        row1 = rows;
        rows = rows * 4;

        System.out.println("\n----Ths is the left arrow pattern-----\n");
        for (r = 1; r < rows; r++) {
            // To print the left arrow
            if (r <= row1) {
                for (c = 1; c <= (row1 - r); c++)
                    System.out.print(" ");
                for (c = r;c <= row1; c++)
                    System.out.print("*");
                System.out.print("\n");
            }
            if (r > row1 && r <= row1 * 2) {
                for (c = 1; c <= (r - row1); c++)
                    System.out.print(" ");
                for (c = 1; c <= (r - (row1 - 1)); c++) {
                    if ((r - row1) < row1)
                        System.out.print("*");
                }
                System.out.print("\n");
            }

            // To print the right arrow
            if (r > row1 * 2 && r <= row1 * 3) {
                if (r == (row1 * 2) + 1)
                    System.out.println("\n----Ths is the right arrow pattern-----\n");
                for (c = (r - 1) - (row1 * 2); c >= 1; c--)
                    System.out.print("  ");
                for (c = (3 * row1) - (r - 1); c >= 1; c--)
                    System.out.print("*");
                System.out.print("\n");
            }
            if (r > row1 * 3) {
                for (c = (row1 * 4) - (r + 1); c >= 1; c--)
                    System.out.print("  ");
                for (c = (r + 1) - (3 * row1); c >= 1; c--)
                    System.out.print("*");
                System.out.print("\n");
            }
        }
        return 0;
    }
}