Java Pattern Printing Collection

This repository contains a set of simple Java programs that demonstrate how to print various patterns using loops and basic logic. The code is grouped into three categories: character patterns, number patterns, and star patterns.

📁 Directory Structure

• Character Patterns/

  • Programs that print patterns using letters (A, B, C, ...).
  • Example: pattern1.java prints a triangle of increasing alphabets.

• Number Patterns/

  • Programs using digits (1, 2, 3, ...).
  • Each file corresponds to a different pattern (triangles, pyramids, matrices, etc.).

• Star Patterns/

  • Patterns made with the asterisk (*) character.
  • Common exercises include pyramids, diamond shapes, and right/left aligned triangles.

Each folder contains 12 example programs named pattern1.java through pattern12.java.

🚀 Usage

1. Open any pattern file in your favorite Java IDE or a text editor.
2. Compile using javac:

   javac pattern1.java

3. Run the compiled class and provide an integer input (rows/size) when prompted:

   java pattern1

4. Observe the printed pattern in the console.

All programs read a single integer from standard input which controls the size of the pattern.

📝 Adding New Patterns

• Copy one of the existing files and update the logic to create a new pattern.
• Maintain the same input strategy (read an integer from Scanner).
• Use descriptive comments at the top to indicate what the pattern looks like.

📚 Learning Goals

These examples are ideal for beginners learning how to use:

• for loops (nested loops)
• Scanner for input
• Basic control flow and character/number arithmetic
• Console output formatting with System.out.print and println

Feel free to explore, modify, and extend these programs as you learn Java!

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Created on Feb 20, 2026