Crown Pattern in Java

The pattern programs are usually asked in interviews to check the logic implementation and loop concepts. In the previous section, we have discussed the various patterns like, triangle, tree, star, etc. In this section, we will learn how to print pattern of crown through a Java program using different logics.

We have divided the Crown Pattern in two sections. The first section contains the first five rows of the crown. The second section contains the last two rows of the crown, as we have shown in the following figure.

Approach

Read total number of rows from the user and store it in an integer variable named row.
Calculate height (h) of the crown by using the formula (row -1)/2.
Define two for loops, first outer for loop and second inner for loop.
Use first for loop to print the row value and a star for each row.
Use first inner for loop to print column value i.e., star according to the following condition:
if (c == 0 || c == h || c == row - 1) and (r == h- 1)and
if ((c < r || c > h - r) &&(c < h + r || c >= row - r)), else print the spaces .
After that print the star (*) symbol according to loop.

Let's implement the above logic in a Java program.

CrownPattern.java

public class CrownPattern
{
  public static void main(String[]args)
  { 
     for(int i=1; i<=5; i++)
     {
         for(int k=1; k<=i; k++)
         {
             System.out.print(" ");
         } 
         for(int j=1; j<=i; j++)
         {
             System.out.print("*");
         } 
         for(int k=1; k<=3*(4-i+1); k++)
         {
             System.out.print(" ");
         } 
         for(int j=1; j<=2*i-1; j++)
         {
             System.out.print("*");
         } 
         for(int k=1; k<=3*(4-i+1); k++)
         {
             System.out.print(" ");
         } 
         for(int j=1; j<=i; j++)
         {
             System.out.print("*");
         } 
         System.out.println();
     }
     for(int i=1; i<=2; i++)
     {
         for(int k=1; k<=5+i-1; k++)
         {
             System.out.print(" ");
         } 
         for(int j=1; j<=2*(9-i+1)+1; j++)
         {
             System.out.print("*");
         } 
         System.out.println();
     }
  } 
}

Output:

Let's see another logic.

CrownPatternExample2.java

import java.io.*;
public class CrownPatternExample2
{
	// function to print crown pattern
	static void crown(int length, int height)
	{
		for (int i = 0; i < height; i++)
		{
			for (int j = 0; j < length; j++)
			{
				// for first row, print '*'
				// i.e, for top part of crown
				if (i == 0)
				{
					// print '*' at first, middle and last column
					if (j == 0 || j == height || j == length - 1)
					{
						System.out.print("*");
					}
					else {
						System.out.print(" ");
					}
				}
				// print '*' at base of
				// crown i.e, for last row
				else if (i == height - 1)
				{
					System.out.print("*");
				}
	
				// fill '#' to make a perfect crown
				else if ((j < i || j > height - i) &&
						(j < height + i || j >= length - i))
					System.out.print("*");
				else
					System.out.print(" ");
			}
			System.out.println();
		}
	}
	//driver code
	public static void main (String args[])
	{
		// length of crown
		int length = 25;
		// height of crown
		int height = (length - 1) / 2;
		// function calling
		crown(length, height);
				
	}
}

Output:

In the following program, we can enter number of rows and character that we want to print.

CrownPatternExample3.java

import java.util.*;
public class CrownPatternExample3
{    
    public static void main(String args[])   
    {   
    //defining cvariables
    int row, r, c, h;
    char crown;
    Scanner s = new Scanner(System.in);
    // entering the number of row
    System.out.print("Enter rows : ");
    row = s.nextInt();
    // entering any random character
    System.out.print("Enter character : ");
    crown = s.next().charAt(0);
//calculates height
    h= (row-1)/2;
    for (r = 0; r < h ; r++)
        {
            // printing stars of the crown 
            for (c = 0; c < row; c++)
            {
                // for first row, print '*' 
                // logic for top part of the crown
                if (r == 0)
                {
                    if (c == 0 || c  == h  || c == row - 1)
                        System.out.print(crown);
                    else
                        System.out.print(" ");
                }
                else if (r == h- 1)
                    System.out.print(crown);
	//logic to print bottom part of the crown
                else if ((c < r || c > h  - r) &&(c < h  + r || c >= row - r))
                    System.out.print(crown);
                else
                    System.out.print(" ");
            }
            // throws cursor to the new line 
            System.out.println();
        }
  }
}

Output: