Added program to rotate any matrix NxN

Programs/matrix/RotateMatrix.java

@@ -0,0 +1,38 @@
+package Programs.matrix;
+
+
+import java.util.Arrays;
+
+public class RotateMatrix {
+    static boolean rotate(int[][] matrix){
+        if(matrix.length == 0 || matrix.length != matrix[0].length) return false;
+        int n = matrix.length;
+
+        for(int layer =0; layer < n/2;layer++){
+            int first = layer;
+            int last = n-1-layer;
+            for(int i = first; i<last;i++){
+                int offset = i - first;
+                int top = matrix[first][i];
+
+                matrix[first][i] = matrix[last -offset][first];
+                matrix[last - offset][first] = matrix[last][last - offset];
+                matrix[last][last -offset] = matrix[i][last];
+                matrix[i][last] = top;
+            }
+        }
+        System.out.println(Arrays.deepToString(matrix));
+        return true;
+    }
+
+    public static void main(String[] args) {
+        int[][] matrix = {
+                {1,2,3,4,5,6},
+                {7,8,9,10,11,12},
+                {13,14,15,16,17,18},
+                {19,20,21,22,23,24},
+                {25,26,27,28,29,30},
+                {31,32,33,34,35,36}};
+        System.out.println(rotate(matrix));
+    }
+}

README.md

@@ -122,10 +122,12 @@ It is very easy to contribute, you may follow these steps -
 95. [Strassen's Multiplication](https://github.com/PrajaktaSathe/Java/blob/main/Programs/StrassensMultiplication.java) - Program to multiply two square matrices using Strassen's Multiplication method.
 96. [Xor Palindrome](https://github.com/PrajaktaSathe/Java/blob/main/Programs/Xorpalindrome.java) - Program/Solution to Xor Palindrome
 97. [Streams API](./Programs/JavaStreams.java) - Program to demo the Java Stream API with String and Integer Lists.
-98.[Stack](https://github.com/PrajaktaSathe/Java/blob/main/Stack.java)-Program to demo the stack implementation
-99.[RotateLinkedList](https://github.com/PrajaktaSathe/Java/blob/main/Programs/RotateLinkedList.java)-Program to demo rotating a linked list
+98. [Stack](https://github.com/PrajaktaSathe/Java/blob/main/Stack.java)-Program to demo the stack implementation
+99. [RotateLinkedList](https://github.com/PrajaktaSathe/Java/blob/main/Programs/RotateLinkedList.java)-Program to demo rotating a linked list
 100. [ReverseString](https://github.com/PrajaktaSathe/Java/blob/main/ReverseString.java) -Program to reverse a String using the java method substring.
-101.[Overriding](https://github.com/PrajaktaSathe/Java/blob/main/Programs/Overriding.java)-Program to demo overriding in java
+101. [Overriding](https://github.com/PrajaktaSathe/Java/blob/main/Programs/Overriding.java)-Program to demo overriding in java
+102. [Rotate Matrix](./Programs/matrix/RotateMatrix.java) - Program to rotate a matrix of NxN in 90 degrees.
+
 
 # Contributors - 
 ## A big thank you to all our contributors!!!