import org.apache.commons.math3.linear.MatrixUtils; import org.apache.commons.math3.linear.RealMatrix; public class MatrixMultiplicationExample { public static void main(String[] args) { double[][] matrixData1 = {{1, 2}, {3, 4}}; double[][] matrixData2 = {{5, 6}, {7, 8}}; RealMatrix matrix1 = MatrixUtils.createRealMatrix(matrixData1); RealMatrix matrix2 = MatrixUtils.createRealMatrix(matrixData2); RealMatrix product = matrix1.multiply(matrix2); System.out.println(product); } }