Java XOR over two arrays [closed]

Question

I have to apply an xor over two arrays like let's say I have :

array_1: 1 0 1 0 1 1 array_2: 1 0 0 1 0 1

I would like to have a function that accepts two arrays and returns an array applying the XOR, so in this case I would like this function to return:

returned_array: 0 0 1 1 1 0

Please help me with an algorithm .. Thanks !

This should help you => stackoverflow.com/questions/726652/… — cggaurav
– cggaurav, Commented Jan 9, 2013 at 18:26
What have you tried? What are you having diffciulty with? It's not obvious what you need help with. I assume you don't want us to just write it for you. — Peter Lawrey
– Peter Lawrey, Commented Jan 9, 2013 at 18:26
A loop and for each element - pair make a xor. What is the problem? — MrSmith42
– MrSmith42, Commented Jan 9, 2013 at 18:28

Juvanis · Accepted Answer · 2013-01-09 18:30:18Z

27

If you are storing these numbers in byte arrays, use this straightforward solution:

byte[] array_1 = new byte[] { 1, 0, 1, 0, 1, 1 }; byte[] array_2 = new byte[] { 1, 0, 0, 1, 0, 1 }; byte[] array_3 = new byte[6]; int i = 0; for (byte b : array_1) array_3[i] = b ^ array_2[i++];

Output array:

0 0 1 1 1 0

answered Jan 9, 2013 at 18:30

Juvanis

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7 Comments

Ben Over a year ago

wow, what means b^array_2[i++]? b power array_2[1] ?

Juvanis Over a year ago

@user1843305 no. ^ is XOR operator in Java.

Ben Over a year ago

but the integer i doesn't increment does it? if it does that would mean that you do something like: b ^ array_2[1] and the i value becomes 1, so you're incrementing it and using it at the same time?

Juvanis Over a year ago

@user1843305 read and learn about array indexes and post-increment please.

px5x2 Over a year ago

cast to byte required. see stackoverflow.com/questions/2003003/…

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Ben · Accepted Answer · 2013-01-09 18:34:54Z

Would this be a good solution? (I wrote this thanks to what you gave me)

if(array1.length==array2.length){ for(int i=0;i<array1.length;i++){ output.add(logicalXOR(array1.get(i),array2.get(i))) } }

Of course array1,2 and output would be arrayLists

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