How to print Hour Glass Pattern in Java - Step by Step Examples

How to print Hour Glass Pattern in Java ?

Answer

To print an Hourglass Pattern in Java, we use nested loops. The outer loop controls the rows and the inner loops control the spaces and stars (*) to form the pattern.

✐ Examples

1 Hourglass Pattern

In this example,

We define a function printHourglass that takes the desired number of rows n as a parameter.
We use two nested for loops, where the outer loop runs from n to 1 and the inner loops control the spaces and stars in each row.
Within the inner loops, we calculate the number of spaces and stars based on the current row number to form the hourglass pattern.

Java Program

// Java Program to print Hourglass Pattern
public class Main {
    static void printHourglass(int n) {
        for (int i = n; i >= 1; i--) {
            String spaces = new String(new char[n - i]).replace('\0', ' ');
            String stars = new String(new char[2 * i - 1]).replace('\0', '*');
            System.out.println(spaces + stars);
        }
        for (int i = 2; i <= n; i++) {
            String spaces = new String(new char[n - i]).replace('\0', ' ');
            String stars = new String(new char[2 * i - 1]).replace('\0', '*');
            System.out.println(spaces + stars);
        }
    }

    public static void main(String[] args) {
        printHourglass(5);
    }
}

Output

*********
 *******
  *****
   ***
    *
   ***
  *****
 *******
*********

Summary

In this tutorial, we learned How to print Hour Glass Pattern in Java language with well detailed examples.

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