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javabytebiginteger

How BigInteger convert a byte array to number in Java?

I have this small code :

public static void main(String[] args)  {

    byte[] bytesArray = {7,34};
    BigInteger bytesTointeger= new BigInteger(bytesArray);
    System.out.println(bytesTointeger);

}

Output:1826

My question is what just happened how an array of bytes {7,34} converted into this number 1826 , what is the operation that caused this result ? like how to convert it manually

Solution

  • The number 1826 is, in binary, 11100100010. If you split that in groups of 8 bits, you get the following:

    00000111 00100010

    Which are the numbers 7 and 34