Nested Loops and Algorithmic Pattern Output

Beginner12 min read•Updated: 2026-10-22

📐 Nested Loops and Algorithmic Pattern Output

Introduction

Writing nested loops builds strong programmatic thinking and visual spatial reasoning. These patterns frequently appear in technical coding interviews and exams.

🌟 Pyramid Pattern Example

1public class PatternDemo {
  public static void main(String[] args) {
      int rows = 5;
4 
      // 1. Right-Angled Triangle
      System.out.println("Right Triangle:");
      for (int i = 1; i <= rows; i++) {
          for (int j = 1; j <= i; j++) {
              System.out.print("* ");
          }
          System.out.println();
      }
13 
      // 2. Centered Number Pyramid
      System.out.println("\nNumber Pyramid:");
      for (int i = 1; i <= rows; i++) {
          // Print leading spaces
          for (int s = 1; s <= rows - i; s++) {
              System.out.print("  ");
          }
          // Print numbers
          for (int j = 1; j <= (2 * i - 1); j++) {
              System.out.print(i + " ");
          }
          System.out.println();
      }
  }
28}

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Array Declaration, Allocation, and Default Values

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Loop Jump Statements: break, continue, and Labeled Breaks	Array Declaration, Allocation, and Default Values

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Array Declaration, Allocation, and Default Values

Nested Loops and Algorithmic Pattern Output

Beginner12 min read•Updated: 2026-10-22

Study Materials

📐 Nested Loops and Algorithmic Pattern Output

Introduction

Writing nested loops builds strong programmatic thinking and visual spatial reasoning. These patterns frequently appear in technical coding interviews and exams.

🌟 Pyramid Pattern Example

1public class PatternDemo {
  public static void main(String[] args) {
      int rows = 5;
4 
      // 1. Right-Angled Triangle
      System.out.println("Right Triangle:");
      for (int i = 1; i <= rows; i++) {
          for (int j = 1; j <= i; j++) {
              System.out.print("* ");
          }
          System.out.println();
      }
13 
      // 2. Centered Number Pyramid
      System.out.println("\nNumber Pyramid:");
      for (int i = 1; i <= rows; i++) {
          // Print leading spaces
          for (int s = 1; s <= rows - i; s++) {
              System.out.print("  ");
          }
          // Print numbers
          for (int j = 1; j <= (2 * i - 1); j++) {
              System.out.print(i + " ");
          }
          System.out.println();
      }
  }
28}

Next Lesson

Array Declaration, Allocation, and Default Values

Continue learning with hands-on practice, examples, and exercises in the upcoming topic.

Related Lessons

Previous Lesson	Next Lesson
Loop Jump Statements: break, continue, and Labeled Breaks	Array Declaration, Allocation, and Default Values

Practice Quiz

Test your understanding of this lesson with 1 questions. Each question has one correct answer.

Previous Next