import Jama.Matrix; public class MatrixOperations { public static void main(String[] args) { double[][] data1 = {{1, 2}, {3, 4}}; double[][] data2 = {{5, 6}, {7, 8}}; Matrix matrix1 = new Matrix(data1); Matrix matrix2 = new Matrix(data2); Matrix result = matrix1.times(matrix2); result.print(); } }