Concentric Square of Stars
This program prints concentric squares of stars.
Problem Statement
Write a Java program that prints concentric squares of stars in a 7x7 grid.
Source Code
| 1 | public class ConcentricSquares { |
| 2 | public static void main(String[] args) { |
| 3 | int n = 7; |
| 4 | for(int i=0; i<n; i++) { |
| 5 | for(int j=0; j<n; j++) { |
| 6 | if(i==0 || j==0 || i==n-1 || j==n-1 || i==1 || j==1 || i==n-2 || j==n-2) { |
| 7 | System.out.print("* "); |
| 8 | } else { |
| 9 | System.out.print(" "); |
| 10 | } |
| 11 | } |
| 12 | System.out.println(); |
| 13 | } |
| 14 | } |
| 15 | } |
Program Output
* * * * * * * * * * * * * * * * * * * * * * * * * * * *
Explanation
The condition checks both the outer border and a second inner border, printing stars at both layers and spaces elsewhere, so the pattern forms two nested square outlines creating a concentric effect.