java数组作为函数返回值

 1 //将一个二维数组行和列元素互换.存到另一个二维数组
 2 package test;
 3
 4 public class test1_8 {
 5   public static int[][] huhuan(int[][] a) {
 6     int[][] b = new int[3][3];
 7     for (int i = 0; i < a.length; ++i) {
 8       for (int j = 0; j < a[i].length; ++j) {
 9         b[j][i] = a[i][j];
10       }
11     }
12     /*
13      * System.out.println("交换后的数组为:"); for (int j = 0; j < b.length; ++j) { for (int
14      * i = 0; i < b[j].length; ++i) { System.out.print(b[j][i] + " "); }
15      * System.out.println(); }
16      */
17     return b;
18   }
19
20   public static void main(String[] args) {
21     // TODO Auto-generated method stub
22     int[][] a = new int[3][3];
23     for (int i = 0; i < a.length; ++i) {
24       for (int j = 0; j < a[i].length; ++j) {
25         a[i][j] = (int) (Math.random() * 100);
26       }
27     }
28     System.out.println("随机产生的一个二维数组为:");
29     for (int i = 0; i < a.length; ++i) {
30       for (int j = 0; j < a[i].length; ++j) {
31         System.out.print(a[i][j] + " ");
32       }
33       System.out.println();
34     }
35     int[][] b = huhuan(a);
36     System.out.println("交换后的数组为:");
37     for (int j = 0; j < b.length; ++j) {
38       for (int i = 0; i < b[j].length; ++i) {
39         System.out.print(b[j][i] + " ");
40       }
41       System.out.println();
42     }
43   }
44
45 }