Looping through byte array - java

Question

I would like to try and loop through this following byte array:

public byte[] mFFTBytes;

How would I go about doing this in java with a for loop?

Thanks in advance!

And how do you fetch the value of mFFTBytes. It's no wonder that you get null pointer exception. — Mladen Uzelac
– Mladen Uzelac, Commented Nov 15, 2014 at 13:19

Dmitry Kazakov · Accepted Answer · 2016-11-28 00:13:47Z

7

First of all you need to instantiate your array because you will have null pointer exceptions all over the place.

Then you can use a for each loop

for(byte b : mFFTBytes){
    System.out.println(b);
}

Dmitry Kazakov

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answered Nov 15, 2014 at 13:12

Gaktan

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2 Comments

I am now getting an error on the for(byte b : mFFTBytes){ line - it is a nullpointerexception - do you know what could be causing this

That's because you didn't initialize mFFTBytes. You need to do : public byte[] mFFTBytes = new byte[size];

TomS · Accepted Answer · 2014-11-15 13:18:14Z

0

I am not sure if I understand well what you are asking for. Going through any array in Java is quite trivial action like:

        for (byte myByte: mFFTBytes) {
            //do something with myByte
        }

or

        for (int i=0;i<mFFTBytes.length;i++) {
            //do something with mFFTBytes[i]
        }

The latter should be faster, but for a vast majority of applications is does not matter much.

answered Nov 15, 2014 at 13:18

TomS

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