java數組作為函數返回值

//將一個二維數組行和列元素互換.存到另一個二維數組
package test;

public class test1_8 {
  public static int[][] huhuan(int[][] a) {
    int[][] b = new int[3][3];
    for (int i = 0; i < a.length; ++i) {
      for (int j = 0; j < a[i].length; ++j) {
        b[j][i] = a[i][j];
      }
    }
    /*
     * System.out.println("交換后的數組為:"); for (int j = 0; j < b.length; ++j) { for (int
     * i = 0; i < b[j].length; ++i) { System.out.print(b[j][i] + " "); }
     * System.out.println(); }
     */
    return b;
  }

  public static void main(String[] args) {
    // TODO Auto-generated method stub
    int[][] a = new int[3][3];
    for (int i = 0; i < a.length; ++i) {
      for (int j = 0; j < a[i].length; ++j) {
        a[i][j] = (int) (Math.random() * 100);
      }
    }
    System.out.println("隨機產生的一個二維數組為:");
    for (int i = 0; i < a.length; ++i) {
      for (int j = 0; j < a[i].length; ++j) {
        System.out.print(a[i][j] + " ");
      }
      System.out.println();
    }
    int[][] b = huhuan(a);
    System.out.println("交換后的數組為:");
    for (int j = 0; j < b.length; ++j) {
      for (int i = 0; i < b[j].length; ++i) {
        System.out.print(b[j][i] + " ");
      }
      System.out.println();
    }
  }

}