Java Number Pattern 31

Posted in Java Tutorial

Updated on Jan 10, 2024

By Mari Selvan

👁️ 174 - Views

⏳ 4 mins

💬 1 Comment

Photo Credit to CodeToFun

Java Number Pattern 31

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

Demo.java

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

💻 Testing the Program

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

Output

1
2*2
3*3*3
4*4*4*4
5*5*5*5*5
4*4*4*4
3*3*3
2*2
1

🧠 How the Program Works

Let's break down the logic behind the code:

The program defines a class named Demo.
Inside the class, there's a main method, which is the entry point of the program. It takes an array of strings args as an argument.
The program declares two integer variables i and j to be used as loop counters.
The first loop for(i=1; i<=5; i++) runs for values of i from 1 to 5 (inclusive), and it represents the upper half of the pattern.
Inside the first loop, there's another loop for(j=1; j⩹i*2; j++) which runs for values of j from 1 to i*2 - 1.
Inside the inner loop, there's a conditional statement. If j is an even number (i.e., j%2 == 0), the program prints a "*" character. Otherwise, it prints the value of i.
After the inner loop completes, the program prints a newline character to move to the next line.
The first loop iterates through values of i from 1 to 5, each time printing a pattern of * and numbers on the same line.
The second loop for(i=4; i>=1; i--) runs for values of i from 4 down to 1, and it represents the lower half of the pattern.
Inside the second loop, there's again an inner loop that prints a pattern of * and numbers similar to the first loop.
The program execution completes after both loops finish running.

💯 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 number 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!