Java Star Pattern 10

Posted in Java Tutorial

Updated on Jan 10, 2024

By Mari Selvan

👁️ 144 - Views

⏳ 4 mins

💬 1 Comment

Photo Credit to CodeToFun

Java Star Pattern 10

Here`s a program that prints the above star pattern using Java Programming:

Demo.java

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

💻 Testing the Program

When you run the above program, it will print the following output:

Output

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

🧠 How the Program Works

Let's break down the logic behind the code:

The program starts with the declaration of the Demo class.
Inside the main method, the following integer variables are declared:
- i for controlling the outer loop (rows).
- j for controlling the inner loop (spaces).
- k for controlling the inner loop (stars).
The first outer loop (for(i=1; i<=5; i++)) runs for i from 1 to 5, controlling the number of rows in the pyramid.
Inside the first outer loop, there are three nested loops:
- The first inner loop (for(j=i; j<5; j++)) prints spaces before the stars. The number of spaces decreases as i increases.
- The second inner loop (for(k=1; k<i*2; k++)) prints stars. The number of stars in each row increases as i increases.
- System.out.println(); is used to move to the next line after printing spaces and stars for the current row.
After the first outer loop, the program enters the second outer loop (for(i=4; i>=1; i--)). This loop runs for i from 4 down to 1, controlling the number of rows in the bottom half of the pyramid.
Inside the second outer loop, there are again three nested loops:
- The first inner loop (for(j=5; j>i; j--)) prints spaces before the stars. The number of spaces increases as i decreases.
- The second inner loop (for(k=1; k<i*2; k++)) prints stars. The number of stars in each row decreases as i decreases.
- System.out.println(); is used to move to the next line after printing spaces and stars for the current row.
Once the second outer loop completes, the program has printed the entire pyramid pattern.

💯 Tips for Enhancement:

Explore the versatility of this pattern by adjusting its parameters. Whether you increase or decrease the size, tweak the spacing, or modify the characters used, each change opens up a world of possibilities, allowing you to customize and create your unique visual effects.

✔ Conclusion:

Creating visually appealing patterns is not only a fun endeavour but also a great way to enhance your programming or design skills. We hope this tutorial has inspired you to explore the world of creative coding. Share your creations with us, and let your imagination run wild!

🤗 Closing Call-to-Action:

We'd love to see your unique interpretations of the star pattern. Share your creations in the comments below, and don't hesitate to reach out if you have any questions or suggestions for future tutorials. Happy coding!