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

Java Program: Java Program to Display the Pattern

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

1 * * * *

* 2 * * *

* * 3 * *

* * * 4 *

* * * * 5

✅ Explanation

🔹 Outer Loop (i)

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

🔹 Inner Loop (j)

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

🔹 Condition

if (i == j)

• Prints the row number on the main diagonal.
• Prints * in all other positions.

🔹 Line Break

System.out.println();

• Moves to the next line after each row.

✅ Key Concepts Used

✔ Nested loops
✔ Conditional statements
✔ Pattern logic