Tutorials

Java Alphabet Pattern 21

Posted in Java Tutorial

Updated on Jan 10, 2024

By Mari Selvan

👁️ 133 - Views

⏳ 4 mins

💬 1 Comment

Photo Credit to CodeToFun

Java Alphabet Pattern 21

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

Demo.java

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public class Demo 
{
 public static void main(String[] args) 
 {
  int i, j;
  // First Part
  for(i=1; i<=5; i++)
  {
   for(j=1; j<i*2; j++) 
   {
    if(j%2 ==  0)
     System.out.print("*");
    else
     System.out.format("%c", i+64);
   }
   System.out.println();
  }
  // Second Part
  for(i=4; i>=1; i--)
  {
   for(j=1; j<i*2; j++)
   {
    if(j%2 ==  0)
     System.out.print("*");
    else
     System.out.format("%c", i+64); 
   }
   System.out.println();
  }
 }
}

💻 Testing the Program

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

Output

A
B*B
C*C*C
D*D*D*D
E*E*E*E*E
D*D*D*D
C*C*C
B*B
A

🧠 How the Program Works

Let's break down the logic behind the code:

The program defines a class named Demo.
Inside the Demo class, the main method is defined as the entry point of the program.
Two integer variables i and j are declared to be used as loop counters.
First Part:
- A nested loop with the outer loop running from i = 1 to i = 5 is used to create the first part of the pattern.
- The inner loop runs from j = 1 to j = i*2 - 1. This ensures that the number of characters printed in each line is odd and increases with each iteration of the outer loop.
- Inside the inner loop, an if condition is used to determine whether to print an asterisk (*) or a letter.
- If j % 2 == 0, an asterisk is printed.
- Otherwise, the program prints a letter determined by the ASCII value calculation: i + 64, which converts the value of i to a character ranging from 'A' to 'E'.
- After each inner loop iteration, a newline is printed to move to the next line.
Second Part:
- Another nested loop with the outer loop running from i = 4 to i = 1 is used to create the second part of the pattern.
- Similar to the first part, the inner loop runs from j = 1 to j = i*2 - 1, ensuring an odd number of characters per line.
- The if condition inside the inner loop behaves the same way as in the first part.
- The ASCII value calculation (i + 64) is used to print the letters.
- A newline is printed after each inner loop iteration to move to the next line.
Once both parts are generated, the program execution completes.
The overall pattern generated by the program consists of a combination of letters and asterisks, forming a visually interesting 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 alphabet 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!