import Jama.Matrix; public class MatrixMultiplicationExample { public static void main(String[] args) { double[][] arrayA = {{1, 2}, {3, 4}}; double[][] arrayB = {{5, 6}, {7, 8}}; Matrix matrixA = new Matrix(arrayA); Matrix matrixB = new Matrix(arrayB); Matrix matrixC = matrixA.times(matrixB); matrixC.print(2, 2); } }