Nested for loops in Java

Chapter 10

Nested for loops in Java

Class 10 - Logix Kips ICSE Computer Applications with BlueJ

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Java Program: Java Program to Display the Pattern

2 (i). Write a program in Java to display the following patterns.

Java Program: Java Program to Display the Pattern

public class NumberPattern {
    public static void main(String[] args) {
 
        int num = 1;
 
        for (int i = 1; i <= 5; i++) {
 
            for (int j = 1; j <= i; j++) {
                System.out.print(num + " ");
                num++;
            }
 
            System.out.println();
        }
    }
}

1
2  3
4  5  6
7  8  9  10
11 12 13 14 15

✅ Explanation

🔹 Outer Loop

• Controls the number of rows (5 rows).

🔹 Inner Loop

• Prints increasing numbers in each row.
• The number of elements per row equals the row number.

🔹 Counter Variable

int num = 1;

• Keeps track of the number to be printed.
• Increments after each print.

🔹 Line Break

System.out.println();

• Moves to the next line after each row.

✅ Key Concepts Used

✔ Nested for loops
✔ Increment operator
✔ Pattern programming