Java serialization of multidimensional array

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Arrays in Java are serializable – thus Arrays of Arrays are serializable too.

The objects they contain may not be, though, so check that the array’s content is serializable – if not, make it so.

Here’s an example, using arrays of ints.

public static void main(String[] args) {

    int[][] twoD = new int[][] { new int[] { 1, 2 },
            new int[] { 3, 4 } };

    int[][] newTwoD = null; // will deserialize to this

    System.out.println("Before serialization");
    for (int[] arr : twoD) {
        for (int val : arr) {
            System.out.println(val);
        }
    }

    try {
        FileOutputStream fos = new FileOutputStream("test.dat");
        ObjectOutputStream oos = new ObjectOutputStream(fos);
        oos.writeObject(twoD);

        FileInputStream fis = new FileInputStream("test.dat");
        ObjectInputStream iis = new ObjectInputStream(fis);
        newTwoD = (int[][]) iis.readObject();

    } catch (Exception e) {

    }

    System.out.println("After serialization");
    for (int[] arr : newTwoD) {
        for (int val : arr) {
            System.out.println(val);
        }
    }
}

Output:

Before serialization
1
2
3
4
After serialization
1
2
3
4

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