import org.jblas.DoubleMatrix; public class MatrixMultiplicationExample { public static void main(String[] args) { double[][] array1 = {{1.0, 2.0}, {3.0, 4.0}}; double[][] array2 = {{5.0, 6.0}, {7.0, 8.0}}; DoubleMatrix matrix1 = new DoubleMatrix(array1); DoubleMatrix matrix2 = new DoubleMatrix(array2); DoubleMatrix resultMatrix = matrix1.mmul(matrix2); System.out.println(resultMatrix); } }