# LeetCode challenge – Rotate Matrix- Java Solution

This is a solution for the LeetCode challenge – Rotate Matrix written in Java ( Source )

You are given an n x n 2D matrix representing an image.Rotate the image by 90 degrees (clockwise).

public class RotateMatrix { public static void main(String[] args) throws Exception { int[][] A = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}; new RotateMatrix().rotate(A); for (int i = 0; i < A.length; i++) { for (int j = 0; j < A[0].length; j++) { System.out.println(A[i][j]); } } } public void rotate(int[][] matrix) { int lc = 0, tr = 0, rc = matrix[0].length - 1, br = matrix.length - 1; while (tr < br) { for (int i = lc, j = tr, k = rc, l = br; i < rc && j < br && k > lc && l > tr; i++, j++, k--, l--) { int temp1 = matrix[j][rc]; matrix[j][rc] = matrix[tr][i]; int temp2 = matrix[br][k]; matrix[br][k] = temp1; temp1 = matrix[l][lc]; matrix[l][lc] = temp2; matrix[tr][i] = temp1; } lc++; tr++; rc--; br--; } } }