Number Pattern in Java: Explanation & Practice

Problem summary

Print a right-angle triangle pattern of numbers with n rows.

Starter code

public class Main {
    public static void main(String[] args) {
        int n = 4; // Test case 1
        
        // Print pattern:
        // 1
        // 12
        // 123
        // 1234
    }
}

Expected output and test cases

• 4-row pattern

  1
  12
  123
  1234

• 3-row pattern

  1
  12
  123

• 5-row pattern

  1
  12
  123
  1234
  12345

Hints

1. Outer loop controls rows (1 to n)
2. Inner loop prints numbers (1 to row number)
3. Print newline after each row

Related Control Flow exercises

• Practice Print Primes in Range in Java
• Practice Sum of Series in Java
• Practice Star Pyramid in Java

Practice all Control Flow exercises · Run this idea in the Java compiler