How do I add two long strings containing binary digits in Java?

Question

I've been trying to add two long strings of binaries using the Integer.parseInt method as radix 2. However, I don't believe that this works for long strings of binary numbers. Is there a better way to do this?

By "binaries" do you mean you have byte[]s that represent the numbers you want to add? — yshavit
– yshavit, Commented Mar 13, 2017 at 3:06
An example of what I have is "10000011100" and "00000011000" but considerably longer and of the same number of characters. — Name158
– Name158, Commented Mar 13, 2017 at 3:07
Maximum you can have for Integer.parseInt with radix 2 is the binary of Integer.MAX_VALUE — mjlowky
– mjlowky, Commented Mar 13, 2017 at 3:14

mjlowky · Accepted Answer · 2017-03-13 03:26:05Z

1

You can use BigInteger with radix:

BigInteger decInt = new BigInteger("111111111111111111111111111111111001111",2);

Have a look at the documentation: http://docs.oracle.com/javase/7/docs/api/java/math/BigInteger.html#BigInteger(java.lang.String,%20int)

edited Mar 13, 2017 at 3:26

answered Mar 13, 2017 at 3:20

mjlowky

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yshavit · Accepted Answer · 2017-03-13 03:09:43Z

0

You can use BigInteger for this. The BigInteger(byte[]) constructor takes a byte array that's interpreted as a two's complement integer, and you can then use the add function to add the two. Keep in mind that add doesn't modify either of the objects, as BigIntegers are immutable. Instead, it returns a new object.

answered Mar 13, 2017 at 3:09

yshavit

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Name158 Over a year ago

Could you provide an example of putting my strings into this byte[]?

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