数组例题

 1 public int[][] matrixMulti(int[][] a, int[][]b){
 2         int[][] ans = new int[a.length][b[0].length];
 3         if (a[0].length != b.length)
 4         {
 5             System.out.println("矩阵无法相乘！");
 6             return ans;
 7         }
 8 
 9         //矩阵a是m*n，矩阵b是n*p的
10         for (int i=0;i<a.length ;i++ )   //i<m
11         {
12             for (int j=0;j<b[0].length ;j++ )    //j<p
13             {
14                 
15                 for (int k=0;k<b.length ;k++ )    //k<n  
16                 {
17                     ans[i][j] += a[i][k] * b[k][i];
18                 }
19             }
20         }
21 
22         return ans;
23     }