众所周知，矩阵的乘法就是矩阵的行列相乘再相加。话不多说，直接上代码：

package test;public class matrixMultiply {public static void printMatrix(int[][] a, int[][] b) {int r = a.length;int c = b[0].length;double result[][] = new double[r][c];for (int i = 0; i < r; i++) {for (int j = 0; j < c; j++) {int temp = 0;for (int k = 0; k < b.length; k++) {temp += a[i][k] * b[k][j];}result[i][j] = temp;}}System.out.println("矩阵相乘的结果为: ");for (int m = 0; m < r; m++) {for (int n = 0; n < c; n++) {System.out.print(result[m][n] + "\t");}System.out.println();}}public static void main(String[] args) {int[][] a = { { 1, 2 }, { 3, 4 }, { 5, 6 } };// 自己定义矩阵int[][] b = { { 1, 2, 3 }, { 4, 5, 6 } };// 自己定义矩阵printMatrix(a, b);}
}

结果为：

9.0 12.0   15.0
19.0 26.0 33.0
29.0 40.0 51.0