Reversing Byte[] - why doesn't this work?

Asked Jul 10 '16 at 23:16

Active Jul 10 '16 at 23:16

Viewed 14 times

I have an array (?) of Bytes and I want to reverse the order of them. I'm getting a NullExceptionPointer error with the following code but I don't get why it doesn't work?

Byte[] m is the thing I want to reverse.

    Byte[] temp = new Byte[m.length];
    int j = 0;

    for (int i = m.length - 1; i < 0; i--) {
        temp[j] = m[i];
        j++;

    }

asked Jul 10 '16 at 23:16

stumpylumpy

Because you've not initialized `m`? – Andy Turner Jul 10 '16 at 23:18
And even if `m != null`, you should use `i >= 0` rather than `i < 0`. – Andy Turner Jul 10 '16 at 23:19
@AndyTurner Sorry I wasn't clear. I don't need to initialize m because it's the input parameter. Yeah, it was i >= 0. :3 – stumpylumpy Jul 10 '16 at 23:22
Then you're passing in `null` as the value of `m`. – Andy Turner Jul 10 '16 at 23:22

Reversing Byte[] - why doesn't this work?

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