MatrixMultiplication.java created and updated.

Author: Nishitha0730

src/main/java/com/thealgorithms/matrix/MatrixMultiplication.java

@@ -0,0 +1,40 @@
+package com.thealgorithms.matrix;
+
+public class MatrixMultiplication {
+    private MatrixMultiplication() {
+    }
+
+    /**
+     * Multiplies two matrices.
+     *
+     * @param matrixA the first matrix     rowsA x colsA
+     * @param matrixB the second matrix    rowsB x colsB
+     * @return the product of the two matrices    rowsA x colsB
+     * @throws IllegalArgumentException if the matrices cannot be multiplied
+     */
+    public static double[][] multiply(double[][] matrixA, double[][] matrixB) {
+
+        if (matrixA == null || matrixB == null) {
+            throw new IllegalArgumentException("Input matrices cannot be null");
+        }
+
+        if (matrixA[0].length != matrixB.length) {
+            throw new IllegalArgumentException("Matrices cannot be multiplied: incompatible dimensions.");
+        }
+
+        int rowsA = matrixA.length;
+        int colsA = matrixA[0].length;
+        int colsB = matrixB[0].length;
+
+        double[][] result = new double[rowsA][colsB];
+
+        for (int i = 0; i < rowsA; i++) {
+            for (int j = 0; j < colsB; j++) {
+                for (int k = 0; k < colsA; k++) {
+                    result[i][j] += matrixA[i][k] * matrixB[k][j];
+                }
+            }
+        }
+        return result;
+    }
+}