Merge pull request #9 from AmaanSayyed/master

Happy Hacktoberfest 2023

README.md

@@ -153,4 +153,17 @@
      *           *
     *             *
    *****************
-```
+```
+15.Hollow Diamond Pattern
+```
+* * * * *  * * * * *
+* * * *      * * * *
+* * *          * * *
+* *              * *
+*                  *
+*                  *
+* *              * *
+* * *          * * *
+* * * *      * * * *
+* * * * *  * * * * *
+```

src/HollowDiamondPattern/HollowDiamondRectangle.java

@@ -0,0 +1,43 @@
+import java.util.Scanner;
+
+
+public class HollowDiamondRectangle {
+        public static void main(String[] args)
+        {
+            Scanner sc = new Scanner(System.in);
+            int i=0, j=0;
+            int n = sc.nextInt();
+            // upper half of the pattern
+            for(i = 0; i < n; i++)
+            {
+                for(j = 0; j < (2 * n); j++)
+                {
+                    if(i + j <= n - 1)  // upper left triangle
+                        System.out.print("*");
+                    else
+                        System.out.print(" ");
+                    if((i + n) <= j) // upper right triangle
+                        System.out.print("*");
+                    else
+                        System.out.print(" ");
+                }
+                System.out.println();
+            }
+            // bottom half of the pattern
+            for(i = 0; i < n; i++)
+            {
+                for(j = 0; j < (2 * n); j++)
+                {
+                    if(i >= j)  // bottom left triangle
+                        System.out.print("*");
+                    else
+                        System.out.print(" ");
+                    if(i >= (2 * n - 1) - j)  // bottom right triangle
+                        System.out.print("*");
+                    else
+                        System.out.print(" ");
+                }
+                System.out.println();
+            }
+        }
+}