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: Program to Print the Pattern

Write a program to generate the following output.

public class StarHashPattern {
    public static void main(String[] args) {
 
        for (int i = 1; i <= 5; i++) {
 
            for (int j = 1; j <= i; j++) {
 
                if (j % 2 == 1)
                    System.out.print("@ ");
                else
                    System.out.print("# ");
            }
 
            System.out.println();
        }
    }
}

@

@ #

@ # @

@ # @ #

@ # @ # @

✅ Explanation

🔹 Outer Loop (i)

• Controls the number of rows (1 to 5).

🔹 Inner Loop (j)

• Controls the number of elements in each row.
• Runs from 1 to i.

🔹 Condition

if (j % 2 == 1)

• Odd position → prints @
• Even position → prints #

🔹 Line Break

System.out.println();

• Moves output to the next line after each row.

✅ Key Concepts Used

✔ Nested for loops
✔ Conditional operator (if-else)
✔ Pattern programming