How to get a signed 32 bit integer from hex bytes without being 2's complement applied to it in java

问题

I have 4bytes of hex values directly without two's complement being applied to signed inetger. How do I get an int value from hex bytes using java.

回答1:

Doesn't this work?

int value = ((0xff & b4) < 24) | ((0xff & b3) < 16) | ((0xff & b2) < 8) | (0xff & b1);

回答2:

Use a Long. You can't use an int as it's always signed and 4 bytes just won't fit.

    Long l = Long.parseLong("FFFFFFFF", 16);

来源：https://stackoverflow.com/questions/7662819/how-to-get-a-signed-32-bit-integer-from-hex-bytes-without-being-2s-complement-a