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byte[] b = new byte[] {-1, -1, -1, -1};
int result = 0;
for (int i = 0; i < 4; i++) {

  result = ((result << 8) | (b[i] & 0xff));
}

Exceptions

NUM02NUM01-EX1: Bitwise operations may be used to construct constant expressions. Nevertheless, as a matter of style, we recommend replacing such constant expressions with the equivalent hexadecimal constants 0x1FFFF, in this case.

int limit = 1 << 17 - 1; // 2^17 - 1 = 131071

NUM02NUM01-EX2: Data that is normally treated arithmetically may be treated with bitwise operations for the purpose of serialization or deserialization. This is often required for reading or writing the data from a file or network socket. Bitwise operations are also permitted when reading or writing the data from a tightly packed data structure of bytes.

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